2007-02-05 12:51:58 · 4 answers · asked by Megan B 1 in Environment
Some gases in the atmosphere trap heat, causing the planet to warm. These are called "greenhouse gases" and the most important ones are carbon dioxide (CO2) and methane (CH4).
Human activity has increased both of these gases by large amounts since the industrial revolution. CO2 has risen from 280 parts per million to 382 parts per million. Methane has increased from 750 parts per billion to 1750. The extra amounts of these gases in the air traps more heat.
2007-02-05 16:28:26 · answer #1 · answered by Keith P 7 · 0⤊ 0⤋
Its mostly by how humans have artered the planet over 2,000 years time. 2,000 years ago the northern hemisphere was mostly rain forest and wet lands. Now all that is gone-done in by humans changing the land use from natural to what we have today. The result is less flora is absorbing less carbon dioxide and solar energy which changes the climate a little bit. It is a problem that should and could be fixed if there was any interest in doing that. There are lots of ways the environment can be improved if a little effort was expended to do it. Its not something you or I or any person can do anything about but large groups can have a good result if the will was there.
2007-02-05 21:08:45 · answer #2 · answered by jim m 5 · 0⤊ 0⤋
By humans dumping 7 billion tons of carbon into atmosphere each year.
2007-02-05 21:18:28 · answer #3 · answered by albatros39a 3 · 0⤊ 0⤋
It's not its a cycle of the earth. Its all lies!
The theory is that carbon dioxide and other harmful greenhouse gases interrupt the chemical process that helps replenish the ozone (O3) layer in the atmosphere that protects the earth from the suns rays or something and less heat can escape from the atmoshpere
2007-02-05 21:00:50 · answer #4 · answered by Anonymous · 0⤊ 1⤋