The only question seems to be how high we should raise taxes on fuels and increase regulation of every phase of people's lives in order to coerce them into using less carbon. But, as Bloch and Lyons point out, it's not really so clear-cut. Of the rest, many thought that were no need to take drastic action at the present time. It's well-established that global temperatures rise and fall in cycles lasting hundreds and thousands of years. The difficulty of proclaiming global warming as a certainty is highlighted by the difficulty that the world's best climatologists using the most advanced computers have in predicting temperatures 90 days in the future.
Radon is a natural gas emitted from uranium.
Small quantities of radon exist almost everywhere, with the greater concentrations being found in areas where gases from natural rocks accumulate most, such as mines and basements. Radon gas decays naturally, and some of the isotopes resulting from the decay can cause lung cancer at high doses. Radon appeared to be particularly carcinogenic when it interacted synergistically with tobacco smoke. Well, not necessarily. After all, salt or alcohol can kill at high doses, and can promote better health at lower doses.