How expensive is climate change, what’s the cost of stopping it, and should we pay now or pay later? Scientific American gets a three-sided look at these questions in side-by-side interviews with Nicholas Stern, Bjorn Lomborg and Gary Yohe.

Stern and Yohe push raising the price of carbon emissions via caps and taxes, respectively, as insurance to ward off big future risks, with Lomborg taking the contrarian view that we shouldn’t mitigate until renewable energy is cheaper — and shrugging off the risks. (Lomborg thinks that other problems like HIV/AIDS and malaria need money more immediately, an argument Olive Heffernan took on in NRCC’s editorial last month.) Interesting discussions of the values assigned to human lives in the present vs. future (Stern, Lomborg), and to lives threatened by asbestos vs. temperature rise, also ensue.

Anna Barnett