"Not only are we harried by time, we seem unable, despite a thousand generations, even to get used to it. We are always amazed at it–how fast it goes, how slowly it goes, how much of it is gone. Where, we cry, has the time gone? We aren’t adapted to it, not at home in it. If that is so, it may appear as a proof, or at least a powerful suggestion, that eternity exists and is our home."

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If humanity wishes to preserve a planet similar to that on which civilisation developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO₂ will need to be reduced from its current 385 ppm [parts per million] to at most 350 ppm... If the present overshoot of this target CO₂ is not brief, there is a possibility of seeding irreversible catastrophic effects.

— James Hansen