Abstract
Children born now could live to witness the planet warming more than 4°C, even if people cut greenhouse emissions by a fair amount. That's one of the terrifying implications of a study that adds to the growing evidence that the official projections underestimate future warming. The biggest problem for global warming forecasts is that they don't know how much more carbon dioxide and other climate-altering stuff will be released. Even if they assume greenhouse gases reach a specific level, climate models still produce a wide range of results. To narrow that range, Patrick Brown and Ken Caldeira, at Stanford, tried to pick the climate models whose projections to date best match real-world data.
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