History of environmental problems in the U.S?

its for my project. i need to show how america is environmentally responsible/irresponsible. can someone state some events that prove my topic? such as the dust bowl...and how it happened when all the trees were cut down to farm wheat,History of environmental problems in the U.S?this website will help you answer these questions: http://www.h-net.org/~environ/historiogr鈥?/a>