Just How Sensitive Is Earth's Climate to Atmospheric Carbon Dioxide?: Scientific American: "Carbon dioxide levels climbing toward a doubling of the 280 parts per million (ppm) concentration found in the preindustrial atmosphere pose the question: What impact will this increased greenhouse gas load have on the climate? If relatively small changes in CO2 levels have big effects—meaning that we live in a more sensitive climate system—the planet could warm by as much as 6 degrees Celsius on average with attendant results such as changed weather patterns and sea-level rise. A less sensitive climate system would mean average warming of less than 2 degrees C and, therefore, fewer ramifications from global warming."
Broken Spring? : Information Clearing House This is a sequel to my June 2011 article, ‘After the spring’, on the upheavals in the Arab world. It is an article that has been painful to write, because it brings bad tidings and offers a pessimistic analysis of the upheavals, at least in the short term, in a number of Arab countries. The outcomes and potential outcomes of these uprisings have also acquired new, very significant dimensions. These include a complex entanglement with the accelerated preparations for a possible attack on Iran, and a poisonous, sectarian aspect that could have the consequence of ripping Syria and the Middle East apart.
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