Newsweek: The effects of climate change will be severe, pervasive and irreversible within the next few decades if countries burn more than just one-quarter of the fossil fuel reserves already found, according to a major new U.N. draft report. Already, failure to heed earlier scientific advice regarding fossil fuel emissions have made large-scale climatic shifts inevitable, but a significant reduction of emissions now could still slow these changes, and buy the human race some time to adapt to an altered...