evidence: I personally believe that there should be some slight warming. But I think the warming will be much less than the current models predict. And I think it will be barely detectable. Perhaps it will be detectable, perhaps not. And it certainly will not be consequential. That is, it won't make any difference to people. After all, we get climate changes by 100 degrees Fahrenheit in some places on the earth. So what difference does a 1-degree change make over 100 years? Well, for instance, it might increase the size of oceans through thermal expansion. So, over time, it would increase the water levels, which have been increasing naturally. [...] But let me go a step further and ask: Supposing carbon dioxide does increase by a factor of four, five--mention any number you wish. What has happened in the past? We have geologic evidence that carbon dioxide levels were twenty times as large during the fossil record as in the last 600 million years, and have been decreasing steadily. So carbon dioxide levels have been decreasing. The earth has experienced much, much higher levels than we have today, without any apparent ill effects, because life developed quite well. In fact, it blossomed forth at the beginning of the Cambrian period.