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Essentially, deforestation occurs from two sources: clearing (chopping down) trees and burning (fires). The latter isn't always caused by humans; it could be caused naturally by such as lightning.

The adverse effects of deforestation are too numerous and involved to be listed here. Here are some articles that explain the process and its effects in detail:

http://en.wikipedia.org/wiki/Deforestation#Atmospheric

http://www.umich.edu/~gs265/society/deforestation.htm

http://earthobservatory.NASA.gov/Features/Deforestation/

http://www.nationalgeographic.com/eye/deforestation/effect.html

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14y ago
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13y ago

Human activity can affect flooding in a couple of ways.

Many civilizations have redirected rivers through the construction of canals and in some cases have brought too much water into areas that could not absorb it. The building of canals has also decreased flooding in areas because it diverts large amounts of water away from a river's flood plane.

Humans have also built dams and blocked rivers which creates artificial lakes and floods large amounts of land behind the damn. Like with canals, the dam also prevents flooding of a river's natural flood plane.

http://wiki.answers.com/How_does_human_activity_affect_flooding#ixzz1Itgnd0Y7

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11y ago

Well one thing is that Global Warming is causing the polar ice caps to melt and will eventually, cause a great flood. Also, since we have longer summers, we are causing more rain and obviously, more floods.

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Q: How does human activities contribute in floods?
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