Under pressure to "tame" the threat of climate change to make it seem compatible with business as usual, many scientists have joined policymakers, economists and journalists in treating ignorance and uncertainty about climate as calculable "probabilities". Carbon traders, too, are forced to treat unknowns (and unknowables) as if they were calculable.

This interview with a Brazilian science magazine touches on the nature of technical fixes for global warming, the US role in formulating the Kyoto Protocol, and how carbon trading is wasting time that could be better spent on other approaches to climate change. (A Portuguese version is appended to the English one.)

For carbon trading advocates, the onward march of "cap and trade" schemes seems unstoppable. But a growing chorus of critics believes otherwise.

Buying "carbon offsets" to "neutralize" your carbon emissions is all the rage in middle-class society in Europe and North America. This book, published by Carbon Trade Watch, explains why offsets are not a constructive approach to climate change.