ClimateWire: The world's largest organization of physicists clarified its position on climate change last week, and it no longer believes, as it did in 2007, that the evidence for global warming is "incontrovertible." Instead, the American Physical Society (APS) now states that climate change is a "critical issue that poses the risk of significant disruption around the globe." It then discusses uncertainties inherent in climate science and the risk involved in not taking action in a draft statement that was...