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Article by Ken Snodin

There has been much discussion, both among experts and lay people about the ‘greenhouse effect.’ The greenhouse effect is a term that refers to changes in the Earth’s atmospheric composition, which have been related to the warming of our planet. There is a growing amount of evidence that human activities, particularly those relating to the burning of fossil fuels like oil and coal, are major contributors to the greenhouse effect. The predicted consequences for the planet as a result of the greenhouse effect are extremely serious. They include major changes in the climate that will have an impact on food production and rising sea levels, which will put many coastal and other low-lying communities under water.

Additional information that we have learned about the planet Venus provide a frightening example of the greenhouse effect. Venus has a very dense atmosphere made up of gases. The planet has what has been described as a ‘runaway greenhouse effect.’ It has surface temperature of about 800 degrees Fahrenheit.

Experts generally point to gases like carbon dioxide as the main contributors to the greenhouse effect. Carbon dioxide, which is a gas that is exhaled by everyone, can absorb infrared radiation. This type of radiation is heat that is radiating away from a warm object. During the day, the Earth is warmed by sunlight, and at night, the Earth cools off by radiating the heat back into space in the form of infrared radiation. Carbon dioxide, and other gases to some extent, absorb this radiation and limit its exit into space. Therefore, the natural cooling mechanism is thwarted.

While it may seem that eliminating the greenhouse effect would be the best strategy, this is not what we want to do. Water vapor represents another element in the heat-absorbing process. There is a great amount of water vapor in the atmosphere at all times. This is why we experience rain. We need the water vapor in the atmosphere to keep the Earth at its normal, comfortable temperature. Without the warmth created by water vapor, the planet would freeze, and that would be the end of life as we know it. Therefore, we need to have some degree of the ‘greenhouse effect’ in order to maintain life on Earth.

We need to strike a balance. Mother Nature is telling us, again, what we should already have learned by now – in any situation, extremes of any kind cause harm.

About the Author

To learn more about our environment and the world we live in visit http://environmentadvice.com

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Proper wood burning does not affect the atmosphere’s carbon dioxide level, and does not promote the greenhouse effect. Dry firewood will burn extremely clean in an efficient stone fireplace, thus producing the same level of carbon dioxide as would be released by the normal process of natural wood decay. This same applies for the nitrogen and sulphuric dioxide levels in comparison to the emission of fossil fuels.

Always Use Dry Wood

An environmentally conscious person always burns dry wood.

Energy Content of Firewood

The thermal value of different wood types is approximately 4.1 kWh/kg in 15% humidity. The energy content of 2.5 kg of firewood equals that of one liter of oil. One cubic meter of firewood releases an equal amount of energy as 190 liters of heating oil.

An efficient fireplace dramatically reduces electrical and oil consumption necessary during the winter. Normally, over half of the home’s annual heating consumption is incurred in the three coldest months of winter. When an efficient fireplace is used during the heating season, it supplies over 50% of the required heat output, while consuming only 10% of the total annual thermal energy requirement. On average three cords of firewood is needed to achieve results.

In an efficient soapstone fireplace, the firewood burns cleanly, with an even draft and hot flame. Thermal energy is quickly stored in the fireplace’s stone, which releases heat slowly and evenly into the room. The fireplace produces minimal emissions. The smoke gases produced by burning wood contain very few substances harmful to the atmosphere. The sulfur level found in wood is approximately 0.05%, making sulfur dioxide amounts in smoke gases very low. The nitrogen level in wood is negligible.

For more information about efficient stone fireplaces, visit Bachmann Fireplaces

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The Greenhouse Effect maybe the most important natural phenomena and may lead to major changes in our lifestyles within our lifetime. Today, whenever there is a natural disaster, the Greenhouse Effect seems to be on the agenda. It wasn’t so long ago that scientists were dismissive of the Greenhouse Effect and there are some still that do not believe it exists, just like there are still people out there that think the world is still flat and the Holocaust never existed. So what is the Greenhouse Effect?

What is the Greenhouse Effect?
The Greenhouse Effect is the culmination of various Greenhouse gases that have been trapped in the Earth’s stratosphere that is leading to the changing of the word’s climate.

• Under the influence of the sun’s rays, the earth’s temperature varies from 0 to about 50oC with an average through night and day, winter and summer, of about 15o C

• The warming is done by rays from the sun, including the very shortest, ultraviolet (UV) rays and the longest infra-red (IR) rays which give you that warm feeling when you walk out into the sunshine, much like an electric radiator warms you when you turn it on and get close to it.

• Some of the incoming rays are reflected back by the clouds in the sky and others by the sea and land, particularly deserts and snowfields.

• Not all those reflected rays go back into space, instead, the atmosphere re-radiates many of the IR rays towards the earth making it warmer still. It is this ability of the atmosphere to re-radiate warm rays which creates the Greenhouse Effect.

• Water vapour, carbon dioxide and certain other trace gases, absorb some of this radiation and prevent it being sent back into space. This “blanket effect” keeps the earth warm. History of the Greenhouse Effect It is not a new phenomena or concept. The term “Greenhouse gas” was first used in the Nineteen Century, by Irish born scientist John Tyndall in a paper he wrote in London’s Philosophical Magazine in 1863. It wasn’t until the 1960’s that Professor Bert Bolin of Stockholm University worked on the phenomenon. When he discussed it with fellow scientists they said “This is science fiction. We don’t believe it”. However by the mid 1970’s things were starting to change rapidly as scientists were starting to accept he was right.

How do we know the Greenhouse Effect exists? What is the evidence?

1. Scientists have analysed climates on planets like Venus and our moon. Venus which is covered by a very dense atmosphere of carbon dioxide. Its surface temperature is around 500 deg C. Whilst the moon which has no atmosphere has an average temperature of approximately -18 deg C. Our atmosphere keeps the surface of our earth, with an average of 15 deg C, some 33 deg C warmer and thus habitable. Evidence of ice cores Over the past 160,000 years carbon dioxide and methane levels trapped in ice cores have varied with global temperature. Scientists have been able to drill out ice cores from the Arctic and Antarctic and measure the levels of carbon dioxide and methane.
Increase in surface temperature of approximately 0.5 deg C over 100 years as carbon dioxide levels increase Studies conducted by scientists have concluded that the earth’s temperature remained fairly constant until the start of the Industrial Revolution. Indeed it did not change much until the start of the twentieth century. From 1880 to 1940 there was a warming of just a quarter of a degree. Most of it was lost between 1940 and 1970. From 1950 to 1980 the average surface temperature was 15 deg C. Between 1970 and 1980 the temperature average went up by three-tenths of a degree C. 1987 and 1988 were the warmest years on record and since then temperatures have been increasing.  In 2009, Victoria Australia, experienced the hottest two days on record- 46 deg C, and one of the days (February 6th) leading to Australia’s worst natural disaster in which over 170 people died as a result of bushfires.

4. Sea levels are rising and small glaciers are melting.

Scientists using satellite and imaging technology have been able to monitor the melting of polar ice caps and glaciers.

What are the results of the Greenhouse Effect?

By using very sophisticated computer modeling, scientists have been able to predict what the world’s climate will be like when carbon dioxide levels have doubled.

Increase in world’s temperature It is thought that there will be an increase in the average global temperature by between 1.5 and 4.5 deg C . • By year 2030 an increase of 2 deg C, by 2100 an increase of 6 deg C. The warming will be greater at higher latitudes and in winter. This will lead to the melting of polar ice caps and glaciers which is already evident, in places like Greenland, the Arctic and Antarctic. Changes in World’s climate The Greenhouse Effect will lead to world-wide changes in weather and climate. Some places may get more rain and storms while other places may get less. Not all changes will be bad. However, almost everywhere in the world will have changes in weather, which will have a big impact on our lives Rising Sea Level It is estimated that by the year 2030, the average sea level will increase by approximately 20 centimetres. This will be due mainly to the melting of the polar ice cap, but also warming of the atmosphere will heat the upper layers of the oceans, which will expand when heated. For low lying countries in the Pacific like Tuvalu and Kiribati, and in the Indian Ocean like Maldives and other countries like Holland may altogether disappear. Other impacts Other impacts could be the dieing out of some species of animals and plants, such as coastal marine environments and coral reefs. Some plants would not be able to survive temperature increases. It takes thousands of years for forests to move north or south to cooler climates. According to Joel B. Smith, co-author of an EPA report states that “such a warming over a century would require forests to move five times faster than the fastest rate recorded by paleontologists since the end of the last ice age”.

What are the primary Greenhouse gases?

They are a number of organic compounds which have more than two bonds (i.e 3 atoms). The seven major Greenhouse gases are:

Carbon Dioxide (CO2) Ozone (O3) Methane (CH4) CFC’s (Freons F11 & F12) Water vapour (H2O) Nitrous Oxides (NOx) Ethane (CH3CH3)

Where do they come from?

Most of the Greenhouse gases have resulted from the burning of fossil fuels. Everything from power stations, motor vehicles, refrigerators, and factory emissions However, CO2 also results from deforestation which releases carbon locked in the soil when trees are felled. CH4 is released from agriculture such as sheep, cattle and manures and places such as tips, sewage treatment plants and mines.

Fossil Fuel contributions

Due to the nature of carbon to hydrogen ratio, different fossil fuels emit different levels of CO2.

Fossil Fuel Carbon to Hydrogen Ratio

Coal Approx.               1:1
Oil Approx.                  1:2
Natural Gas Approx.     1:4

• Hence combustion of coal produces twice the CO2 of natural gas

CO2 Levels in the atmosphere (parts per million)

Pre Industrial Revolution      270 ppm
1988                                  345 ppm
Today                               >355 ppm

By measuring bubbles of gases trapped in polar ice, scientists have shown that the amount of CO2 in the atmosphere prior to the Industrial Revolution was about 270 parts per million (ppm). A special monitoring station established atop from the mountain Mauna Loa in the Hawaiian Islands showed that by 1957 CO2 levels in the atmosphere to 315 ppm, an increase of 17%. By 1988, it had passed 345 ppm. A rise in 31 years of another 11%. An increased total of about 30% since the start of the Industrial Revolution. Expert’s further forecast that CO2 will reach a level of 500-700 ppm by the year 2050, a doubling inside 200 years.

Percentage Contribution of Greenhouse gases to the Greenhouse Effect

CO2                            55%
CFC (F-11/F-12)*         17%
CH4                            15%
NO                              26%
Other                            7%

* Please note that CFCs have been phased out since the mid-nineties

To stablise atmospheric concentration of various gases at present day levels, the following reductions would be required instantly:

CO2                     60%
CH4                    15-20%
NO2                    70-80%
CFC (F-11)*           70-75%
CFC (F-12)*           75-85%

Remaining Scientific Uncertainty
No argument that increasing concentrations of heat trapping gases will lead to an increase in average temperatures world-wide.

However there is an argument about the extent in some cases of various positive and negative effects.

1. Uncertainty in effects of clouds Cumulus- negative cooling effect reflect incoming sunlight High Altitude clouds- positive effect by trapping infra-red radiation from earth

This uncertainty explains variation in temperatures from 1.5 deg C to 4.5 deg C.

2. Combustion of fossil fuels e.g. coal to sulphur dioxide (SO2) has cooling effect.

3. Variations in sun’s output are responsible for temperature increases.

4. Ocean levels will naturally increase due to thermal expansion of surface ocean water and melting of glaciers.

An increase in temperature will lead to increased precipitation, which will increase ice thickness at poles, thus reducing sea level.

5. Natural regional climatic changes, such as deforestation and bushfires, as opposed to global changes.

Policies for Greenhouse Emission Reduction Problems

Different countries emit vastly different CO2 levels per capita Countries have very different per capita incomes Very difficult to work out the warming potential for each Greenhouse Gas in terms of CO2 equivalent. Emissions of gases from various countries are not known with certainty

Policies

1. Each country can reduce by the same percentage

Existing emission levels are uneven per capita are taken as standard Poor countries want to increase fossil fuel usage

2. Each country gets the same emission quotas on a per capita basis.These countries sell quotas to rich countries.

3. Rich countries could reduce emissions by 20% with no reductions required by poor countries.

• Not all rich countries have high emissions of CO2, and not all poor countries are low emitters because of deforestation.

4. Assume Australia which is high income and high Greenhouse Gas emitter per capita is required to reduce emissions by 20%.

• How should it be reduced? By: a) each state? b) each industry section?

Some methods of reducing CO2 emissions that have negative impact on our lives;
• Better managing of natural resource;
• Reducing waste in manufacturing;
• Find alternative end uses for waste (recycle and reuse);
• Buying less junks and goods that we don’t need (In Australia, estimated to be worth AUD billion per annum);
• Buying quality goods that don’t need replacing as often;
• Recycling more (e.g. it takes about 8 times more energy to convert bauxite to aluminium than it does to recycle it)
• Reduced use of motor vehicles;
• Increased use of public transport;
• More efficient lighting, heating and cooling;
• Better insulation;
• Less reliance on electricity and electrical goods and machines;
• More efficient electrical appliances;
• More efficient cars;
• Alternative technologies from natural sources such as wind, thermal and tidal;
• Converting landfills and sewage plants into methane plants;
• Bio-fuels such as bio-diesel, methanol and ethanol production from organic waste sources
• Reduce large scale deforestation and land clearing;
• Increase tree planting;
• More efficient agriculture including No till and Conservation agriculture methods;
• Organic farming.

Article by jekky

HC Environmental Network: What is a “zero carbon”? If not visited The Expo Urban Best Practices Area E Area Zero Carbon Museum London, 100 individuals may have a hundred answers. Yesterday morning, the London case of zero-carbon Stadium opening ceremony, visitors will have the opportunity to enter China’s first “zero carbon dioxide emissions” building experience “zero carbon” way of life. Zero Carbon Museum of London curator, said Chen Shuo, within two years, China’s self-built “zero carbon” community is expected to occur. Consequences of the greenhouse effect under high temperature experience6 this morning, ushering in the official opening of the Expo Site, after the first rains, swept away many days of high temperatures. Urban Best Practice Area in case of zero-carbon Museum in London, conference room, though hot. Here, the “case of zero carbon Expo Hall in London opening ceremony and launch of zero carbon Union” is being held, the meeting deliberately creating the scene in 40 , to draw attention to the greenhouse effect causing global warming concerns. Standing in the conference room door, an hot air blowing, sitting in the venue feeling unbearably hot, especially standing on the rostrum of the Speaker, under the direct light is sweaty. Organizers explained, so “abusive”-style opening ceremony, designed to allow participants to experience if global warming continues, the survival of mankind would be very bad state. Zero carbon is a way of lifeMeeting space, the reporter interviewed curator Chen Shuo zero carbon. He explained: Zero Carbon is a lifestyle, not a specific standard, in fact, absolutely zero emissions of carbon dioxide can not do. Zero carbon building is the use of various means to reduce the pollution caused by their own, and rational use of waste, use Environmental protection Cleaning Energy To reduce carbon dioxide emissions and ultimately achieve “zero waste” and “zero energy” and “zero waste” of the ideal state. In short, by Solar Energy , Wind Energy Produced by fermentation of organic waste Biomass As a core energy to achieve “zero energy”; through the roof to collect rainwater flushing the toilet or watering to reduce water demand, in order to achieve “zero waste”; the organic waste used to generate electricity, will be made into furniture or inorganic construction waste materials, thus achieving “zero waste.” That is the main principle of zero carbon housing. China or have its first zero carbon communityIntroduced, according to Chen Shuo, a prototype zero-carbon from the Museum of London Beddington community, the community has been hailed as “the first zero-carbon community”, is the UK’s largest environmental and ecological Cell. Since the residents admitted since 2002, known worldwide, is recognized internationally as the most important building of sustainable energy and living examples. Chen Shuo, in fact, zero-carbon house of China as early as two years ago to begin, there are technically no problem, the key is how to reduce the cost of zero-carbon house to be promoted range. Zero carbon house in the housing owner to invest the money, you can save water by means of recovery, 7 to 8 years if the cost can be recovered, then the zero-carbon house is worth a massive scale; if the process takes 15 years, it can be small scale trials; 20,30 if the process takes years, it can only come as a case study. Can promote, when to promote, all depend on the market. Is currently being tested Map The zero-carbon house cost 1,500 yuan per square meter control (based on the standard price), and if all goes well, within two years, China may be the first pilot zero carbon community.

About the Author

I am Frbiz Site writer, reports some information about jumbo dice , glass bead game.

Article by carbonadvicegroup

In layman terms, greenhouse effect is the rebound of the radiative energy (in the form of thermal energy) in all directions, in the atmosphere. In fact, this energy is redirected in all directions, but it is of utmost importance to regulate it back in the atmosphere; this is done so that balance can be brought about in humans and nature. A very important aspect of this whole process are the green house gases – water vapor (36-70%), carbon dioxide (9-26%), methane (4-9%), ozone (3-7%). These gases, also known as the atmospheric gases are basically responsible for trapping the thermal energy.

We see the greenhouse mechanism everyday – when our cars get heated up in the sun, in the nurseries with shades etc. the energy which is trapped back in these surfaces is indeed great for its respective processes; but when it comes to the atmosphere, it is a different thing altogether. Like the saying goes, excess of everything is bad, in the same way; the excess of the greenhouse gases (resulting in excessive radiative energy) is bad for the natural heath of the flora, fauna as well as Homo sapiens.

With the progress of mankind, discovery of fuel, deforestation, agricultural practices resulting in the emission of atmospheric methane, extensive use of CFC (chlorofluorocarbon) industrialization etc, carbon dioxide has only kept increasing in the atmosphere; and as compared to other gases, the increase in the level of carbon dioxide is the most alarming because it absorbs the most of the radiative energy.

Many measures have been taken worldwide to take initiatives to conserve energy and indirectly prevent global warming created by the greenhouse effect. There are alternate methods of utilizing energy such as solar energy, wind energy etc – which are of course very expensive, but a cheaper way to use them must be found as soon as possible. Another way to contribute our bit is through the ‘carbon offset‘.Carbon offset is simply an effort to reduce the emission of carbon or other greenhouse gases so that this reduction is compensated for an atmospheric gases’ emission elsewhere. These are measured in metric tons of carbon dioxide-equivalent (CO2e). One carbon offset is equivalent to the reduction of one metric ton of carbon dioxide or the other greenhouse gases.

These are achieved by supporting the alternative or renewable energy plants or equipments. Here the support means a financial support. Due to the Corporate Social Responsibility measures growing throughout the world, Business carbon offsets have become a major way of contribution.

About the Author

For more information about sell carbon offset and business carbon offsetting please visit http://www.carbonadvicegroup.com/uk/

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The Earth and Venus are near each other in the Solar System, and are similar in size, density, and composition. Based on our understanding of the origin of the Solar System, we would expect that their initial atmospheres would have been rather similar. Yet the present atmospheres of the two planets could hardly be much more different than they are. How did this come to be? The reason is thought to lie in what is termed the “Runaway Greenhouse Effect”.

Sunlight falling on the surface of a planet is primarily in the visible part of the spectrum. However, the reflection of light from the surface tends to produce light of longer wavelength called infrared (IR) radiation (also known as radiant heat; IR radiation is the heat that we sense being radiated from a hot surface like a hot piece of metal).

Now, because of their molecular structures, certain gases like carbon dioxide and water vapor (and many others) have the property that they are essentially transparent to visible light but absorb IR radiation very strongly. Such compounds are sometimes termed greenhouse gases because, if they are present in a planetary atmosphere, they absorb the scattered IR radiation and tend to raise the temperature of the atmosphere by trapping solar energy. (The analogy with a real greenhouse is imperfect because the mechanism by which a greenhouse stays warm is different, but it is sufficiently good that the name “(Planetary) Greenhouse Effect” is now the common one for this phenomenon.)

The greenhouse effect occurs for all planetary atmospheres containing greenhouse gases, and is responsible for their being warmer than would be the case otherwise. The greenhouse effect by itself could not account for the conditions that we find on Venus. However, under certain conditions we believe the greenhouse effect can “run away”. For example, consider the case of a planet like the Earth. The Earth has enormous amounts of two greenhouse gases: water vapor and carbon dioxide. However, for the Earth most of the water and carbon dioxide are not in the atmosphere. The water is mostly in the oceans, and the carbon dioxide is mostly bound chemically in rocks made from compounds that chemists call carbonates (for example, limestone).

Now suppose we increased the effectiveness of greenhouse heating of the Earth’s atmosphere, for example by increasing the amount of solar radiation falling on it, or by increasing the concentration of greenhouse gases in the atmosphere (for example, by burning fossil fuels, which produce water vapor and carbon dioxide as byproducts of burning). We would then expect the temperature to rise in the atmosphere (assuming no other effects intervened—a big “if” in the realistic case since the atmosphere is complicated). This would be a greenhouse effect.

It would become a runaway greenhouse effect if the rising temperature approached the boiling point of water, because then the oceans would begin to convert to water vapor, the water vapor would increase the effectiveness of heat trapping and accelerate the greenhouse effect, this would cause the temperature to rise further, thus causing the oceans to evaporate faster, etc., etc. (This type of runaway is also called a “positive feedback loop”.) When the oceans were gone the atmosphere would finally stabilize at a much higher temperature and at much higher density, because all the water would now be in the atmosphere.

We can envision even a further runaway stage in this scenario. Suppose the preceding runaway raised the temperature so high that chemical reactions begin to occur that drive the carbon dioxide from the rocks into the atmosphere (the process is called sublimation; a few hundred degrees Celsius would be sufficient). Then another runaway would occur as the carbon dioxide feeding into the atmosphere would accelerate the heating, which would in turn accelerate the transfer of carbon dioxide from the rocks to the atmosphere.

The atmosphere would finally stablilize at a still higher temperature and pressure after all the carbon dioxide had been driven from the rocks. In fact, we believe that if this sequence were to take place on the Earth, the resulting temperature and pressure of the atmosphere left behind would not be very different from that for present-day Venus: the atmospheric termperature would be hundreds of degrees Celsius and the pressure would be maybe 100 times greater than it is today.

Thus, we believe that in the case of Venus the initial solar heating kept oceans from forming, or kept them from staying around if they did form, and the subsequent lack of rainfall and failure of plant life to evolve kept the carbon dioxide in the atmosphere rather than binding it in the rocks as is the case for the Earth; thus, Venus has an environmental disaster for an atmosphere.

The sobering warning for us is obvious: we have to be extremely concerned about processes such as burning of fossil fuels in large volumes that might (we don’t know for sure because the scientific questions are complex) have the potential to trigger a runaway greenhouse effect and produce on the Earth atmospheric conditions such as those found on Venus.

The greenhouse effect has been under scrutiny for decades. Many scientists and politicians want to blame the greenhouse effect for the majority of our problems with the environment and global warming. In reality, however, the greenhouse effect is what keeps most of life on earth as we know it healthy and thriving.

The greenhouse effect is the term scientists gave to the natural occurrences that keep warmth and moisture on the earth’s surface. The phrase was coined as such because the way that the gases in the earth’s atmosphere trap warmth and moisture on earth is much the same way that greenhouses trap warmth and moisture that allows plants to grow healthy and strong in all climates.

When the suns rays hit the earth’s atmosphere they are bounced off again back into space. The majority of the sun’s rays are reflected without ever being noticed by life on earth. However, some of the sun’s rays are caught up in gases such as carbon dioxide, ozone, methane, and water vapor. These gases trap some of the warmth from the sun’s rays and hold them to the earth. This is called the greenhouse effect.

Scientists estimate that without the greenhouse effect, earth would be approximately fifty four degrees cooler than it is now. This jump into lower temperatures would actually kill off most of the plant life on earth, and make it impossible for many species to survive. Basically, life on earth as we know it would die off without the benefits of the greenhouse effect.

So is the greenhouse effect really a bad thing? Of course not, although the increase in gases in the earth’s atmosphere does pose a problem. While the greenhouse effect in its natural form is necessary for life on earth, you can have too much of a good thing.

Humans have added gases to the earth’s atmosphere through industry, such as the gases released during the burning of oil, natural gas, and coal. These gases become a part of the earth’s atmosphere and are added to the gases already there. This strengthens the greenhouse effect, trapping more heat in the earth than is actually necessary or desired. This is the cause of global warming.

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What do greenhouses, glasshouses, and hothouses have in common? They all refer to a facility that controls the environment where specific crops are to be planted and harvested. In countries where harsh weather and climate conditions are manifest, greenhouses have revolutionized the green industry. By use of such a facility, one is able to control certain factors such as heat, temperature, and the like; creating or extending Read more…

In fact, the greenhouse effect is really needed by the living creatures on earth, with no greenhouse gases, the planet will be very cold reaches minus 18 degrees centigrade so that the ice will cover the whole surface of the earth. However, due to the amount of these gases in the atmosphere have been excessive, then there were global warming.

Global warming caused by the effect of the Glass House event the surface of the Read more…

You cannot plan effectively for your future until you understand what climate change holds for you. If you decided to do that then the Greenhouse Effect would be the first thing you would want to master. It’s not difficult and you will own it by the time you finish this page.

About 30% of the light arriving from the sun hits our atmosphere and bounces off, back out into space. The balance of the sun’s light continues Read more…