During a debate on climate change legislation in 2009, a U.S. congressman declared that human-induced global warming is a hoax and that there is no scientific consensus. (a) If you were a member of Congress, what points might you raise in the debate to demonstrate that global warming is real? (b) What points might you raise to demonstrate that global warming has been influenced by humans? (c) What actions might you propose in the United States to reduce CO2 emissions?