Most scientists agree that the earth is heating up, but the cause of global warming is less certain.
From volcanoes, to El Nino, to human activity, find out which is the mostly likely culprit. Also, times when weather made history. Michael Oppenheimer , Chief Scientist at the Environmental Defense Fund in New York, tells Jim Fleming what he and the other delegates are discussing at the gobal climate talks in Kyoto, Japan. Oppenheimer supports the proposals for a treaty limiting emissions of greenhouse gasses. Gail McDonald , President of the Global Climate Coalition, is also in Kyoto.