We are now entering the Greenhouse century as we know it. Planet Earth is estimated to be 4.5 billion years old, and life on earth has existed for more than 3.5 billion years. Humans have been on earth for 2 to 3 million years. It is only been in the past 200 years people have been affected by global warming. The last 40 years have been the most damaging.

As the impacts of human influences have grown, so have the risks associated with those impacts. New technologies carry increasing risks, and the scale, frequency, and impacts of disaster caused or influenced by human activity are growing tremendously. The risks to the Earth's natural systems are becoming significantly concerning.

The world's population, currently 5.2 billion has grown from about 3 billion in 1960, and around 2 billion in 1925. Today it increased by almost 90 million each year, and is likely to reach 10 billion by 2025(Corson 4).

The next few layer have almost no ozone or any water vapors. Air is less dense here and not even sound travels well here.

Ozone is a form of oxygen. The ozone absorbs most of the sun's ultraviolet radiation. This has two important effects, First, it warms the air in the stratosphere. Second, it prevents much of the harmful rays from reaching the earth surface. Temperature in the layer reaches 29„a f.

Some common words found in the essay are:
Carbon Dioxide, Planet Earth, Global Warming, West Antarctic, War II, North America, carbon dioxide, Methane Greenhouse, Greenhouse Effect, global warming, Warming Greenhouse, amount carbon dioxide, dioxide atmosphere, carbon dioxide atmosphere, fossil fuels, amount carbon, layer extends, life earth, solar energy, gases atmosphere, reaching earth, burning fossil fuels,
Approximate Word count = 1203
Approximate Pages = 5 (250 words per page double spaced)