| http://www.w3.org/ns/prov#value | - Hansen argues that 350 parts per million is the highest level we can maintain ???if humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted.??? But because we???re already past that mark???the air outside is currently about 387 parts per million and growing by about 2 parts annually???global warming suddenly feels less like a huge
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