Greening your lifestyle is tricky, but greening your auto is downright complex. Should you switch to electric? Is a hybrid good enough? And just where can you get biodiesel these days? It's enough to make even the eco-friendliest heads spin. But have no fear. Popular Science knows that switching from fossil fuels requires some ingenuity, and we've culled some tips to make the, uh, ride smoother.
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In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.
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