Thanks for blogging about this and adding to the discussion, Michael.
Perhaps Alain Robert's message would have been more persuasive if he had included a citation on that banner, but his claim that climate change kills more people than 9/11 every week is supported.
The World Health Organization (WHO) has estimated that human influence on the climate was already killing more than 150,000 people each year by 2000. WHO says that this estimate is conservative because it considers only a subset of health effects, and the organization expects the number to more than double between 2000 and 2030. Still, a death toll of 150,000 per year breaks down to 2,885 deaths per week, compared with 2,973 deaths from 9/11.
A paper published in Nature November 17, 2005, breaks this number into causes. It finds that the vast majority of deaths caused by anthropogenic climate change can be blamed on malaria (16%), diarrhea (28%), and malnutrition from crop shortages (46%).
The Nature paper also breaks the number into regions of the world. It finds that virtually all of these deaths occur in developing countries, which is one reason that simply drawing attention to the seriousness of the problem is insufficient.
Details are here:
http://www.nature.com/nature/journal/v438/n7066/full/nature04188.html (see especially Table 1 and Figure 2).
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