Global Warming

· What does the greenhouse effect have to do with global warming? (What does the greenhouse effect have to do with global warming?)
· What is causing global warming? (What is causing global warming?)
· What is the best source of scientific information on global warming? (What is the best source of scientific information on global warming?)
· Is global warming already happening? (Is global warming already happening?)
· Are humans contributing to global warming? (Are humans contributing to global warming?)
· How much warmer is the Earth likely to become? (How much warmer is the Earth likely to become?)
· Would a temperature rise of a couple degrees really change the global climate? (Would a temperature rise of a couple degrees really change the global climate?)
· Is global warming connected to the hole in the ozone layer? (Is global warming connected to the hole in the ozone layer?)