By all means, swap out your regular light bulbs for compact fluorescents, take the bus, weatherize your home and install solar panels on your roof. Oh, heck, go crazy: tell your senators to give the nuclear industry everything it wants so it starts building reactors again. But while you're doing all that to reduce the world's energy use and cut emissions of greenhouse gases, keep this in mind: even if we scale up existing technologies to mind-bending levels,such as finishing one nuclear plant every other day for the next 40 years, we'll still fall short of how much low-carbon energy will be needed to keep atmospheric levels of carbon dioxide below what scientists now recognize as the point of no return.
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