Global warming is the warming near the earth's surface that results when the earth's atmosphere traps the sun's heat. The earth is getting warmer. The changes are small, so far, but they are expected to grow and speed up. Within the next fifty to one hundred years, the earth may be hotter than it has been in the past million years. As oceans warm and glaciers melt, land and cities along coasts may be flooded. Heat and drought may cause forests to die and food crops to fail. Global warming will affect weather everywhere, plants and animals everywhere, people everywhere; humans are warming the earth's atmosphere by burning fuels, cutting down forest, and by taking part in other activities that release certain heat trapping gases into the air.
Then, how the global warming cause? What are the main global warming causes?
There are three main chemical substance of global warming.
First, carbon dioxide, it is from fossil fuel, deforestation , failing sink.
Second, methane , it is from cattle dejection , the arctic tundra.
The last one is nitrogen oxides, it is from farming.
Because of three chemical substances, earth is warming.
Essentially three chemical substances are from human being.
For example, we make factory which need a lot of fossil fuel. People cut the tree which change carbon dioxide into oxygen.
Global warming is big issue that we must notice about that.
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