Abstract
Atmospheric physicists show us that rising concentrations of certain greenhouse gases in Earth's atmosphere should raise the temperature of the planet at rates, times, and places that are consistent with recent observations of ongoing climate change—that is, global warming. The unfolding impacts of this climate change will affect human habitation, health, and economics, and the persistence of various species in natural ecosystems during the course of this century. Much debate stems from what to do about these impacts, focusing on the cost of changing our energy infrastructure that is now dominated by fossil fuels. Alternative futures exist, but it will take great leadership to guide us to a sustainable future before we experience huge destructive impacts on the environment of our only planetary home.
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