Weekly Digest – September 28, 2014

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Prof. Mario Molina, who won the Nobel Prize in chemistry for elucidating the threat that refrigerant gases (chlorofluorocarbons) pose to the ozone layer, uses the image above to convey the state of understanding of human-driven climate change.  Prof. Molina:

There appears to be a gross misunderstanding of the nature of climate change science among those that have attempted to discredit it. They convey the idea that the science in question behaves like a house of cards: if you remove just one of them, the whole structure falls apart. However, this is certainly not the way the science of complex systems has evolved. A much better analogy is a jigsaw puzzle: many pieces are missing, and some might even be in the wrong place, but there is little doubt that the overall image is clear, namely that climate change is a serious threat that needs to be urgently addressed. It is also clear that modest amounts of warming will have both positive and negative impacts, but above about 4 or 5 degrees Fahrenheit most impacts turn negative for many ecological systems, and for most nations.

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