In his inaugural address, President Barack Obama made climate change a priority of his second term. It may be too late. Within the lifetimes of today’s children, scientists say, the climate could reach a state unknown in civilization…An international political consensus set as a danger zone two degrees of warming, expected in 25 years on current trends when atmospheric concentration of CO2 reaches 450 parts per million. It is now 400 parts per million. Two degrees is "an arbitrary number," said Alan Robock, director of the Center for Environmental Prediction at Rutgers University. "On our current path, we will go zooming way past that."
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