coal or oil is mined, you have to dig up the earth a little. When you dig up the fossil fuels, you dig up the methane as well.
Another major man-made
6
of global warming is population. More people
7
more food, and more transportation, right? That means more methane because
8
will be more burning of fossil fuels,
9
more agriculture. Now you are probably thinking, "Wait a minute. You said agriculture will be damaged by global warning, but
10
you are saying agriculture is going to help cause global warning?" Well, have you
11
been in a bam filled with animals and you smell something terrible? You are
12
methane. Another source of methane is manure(粪肥). Because more food is needed, we have to
13
food. Animals like cows are a source of food which means more manure and methane. Another problem
14
the increasing population is
15
. More people means more cars, and more cars means more pollution. Also, many people have more than one car.
Since CO2 contributes to global warning, the increase in population makes the problem worse because we breathe out CO2.
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