If the threat of global warming has been created by our reckless use of technology, can we use technology to eliminate the threat? We could try to cool the earth by deliberately polluting the atmosphere, as volcanoes do, but suppose we overcooled the planet, creating another ice age? This program suggests some less drastic solutions to the problem of global warming: reducing CO2 emissions; harnessing the energy of the sun and the wind; using nuclear power; conserving energy; curbing or stopping the use of CFCs; and preserving the rainforest. But the basic fact is that greenhouse gases are produced by fundamental biological processes, and there is no reasonable way to stop their proliferation. It may also be taken as a given that, while individuals may be able to adapt to climatic change, societies cannot. (26 minutes)