Provocative little fifteen-minute TED Talk clip of Bjorn Lomborg arguing that of the big problems facing the world, global warming should be at the bottom of the priority list ($150 billion/year to postpone warming by 6 years in 2100, assuming global warming). The so-called Copenhagen Consensus put the priorities, in descending order, as (1) HIV/AIDS ($27 billion in eight years to reduce incidence by 28 million cases), (2) malnutrition ($12 billion to significantly reduce malnourishment for half the world's population), (3) free trade ($2400 billion pumped into global economy in two to five years to bring 200-300 million people out of poverty), and (4) malaria ($13 billion in four years to reduce incidence by half), on the premise that there is more bang for the buck addressing these.
Not the end-all, but thought provoking. Some of the comments below the video are good, too. Lomborg takes a lot of criticism for his ideas.
http://www.ted.com/index.php/talks/bjorn_lomborg_sets_global_priorities.html
(The video apparently front-loads, so it takes a bit to start playing.)

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