Both your main leader and the survey on how business is tackling climate change stress the political risk involved (“Cleaning Up,” June 2, 2007). If governments do not act to constrain carbon emissions, the current business initiatives, which assume such constraints in the future, will eventually wither. Given your focus on business, though, you do not assess the likelihood that governments will do what is required of them. More important, you do not consider alternative climate-change scenarios, which are crucial in this analysis. In the best case, assuming gradual climate change, governments may eventually catch up with business. In the worst case, assuming dramatic climate change, governments will surely add to the chaos rather than help alleviate it. In short, much will depend on climate change itself, which you leave out of your analysis.