Is substantially reducing CO2 emissions worthwhile?

Global warming is real and caused by CO2. The trouble is that the climate models show we can do very little about the warming. Even if everyone (including the United States) did Kyoto and stuck to it throughout the century, the change would be almost immeasurable, postponing warming by just six years in 2100. Likewise, the economic models tell us that the cost is substantial. The cost of Kyoto compliance is at least $150 billion a year.

There is some evidence to show that our planet Earth is becoming warmer and that human action is probably partly responsible, especially in the matter of greenhouse gas emissions. What is in doubt, however, is whether the steps that are proposed to be taken to reduce carbon emission will really bring down the carbon dioxide level in the atmosphere and whether such attempts, even carried out on a global scale, will produce the desired effect.

The IPCC's account of things seems to me only one possibility, and the evidence for it is not very strong. For that reason, I would counsel that we accept that climate changes, and learn, as indeed human beings have learned for thousands of years, to adapt to that change as rationally and sensibly as we can.