Top news for December 21, 2008

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In ‘Cancer Alley,’ a Battle Over Who Gets to Measure Air Pollution

Trump Signs Executive Orders for Faster Build-Out of Nuclear Power Plants

Documents Show E.P.A. Wants to Erase Greenhouse Gas Limits on Power Plants

Record-Breaking Catalyst Converts Carbon Dioxide Into Valuable Chemicals

MIT Breakthrough Makes Carbon Capture 6x More Efficient

Want to Claim the Solar Tax Credit? Get Installing Now

China is building a constellation of AI supercomputers in space — and just launched the first pieces

Readers discuss the biology of sex, plastic in the brain and more

The long and short of science

Bacteria Living on Your Skin May Help Protect You From The Sun, Study Says