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If approved, new rules could threaten the climate and U.S. forests.
Umbra Fisk stirs up advice on cookware for a reader from Virginia.
Advice columnist Umbra Fisk warms to the topic of efficient home heating systems.
A new study found air pollution around Alberta's tar sand operations to rival a major city.
You probably didn't even notice.
Yes, you read that correctly.
A new report reveals the big water problems California has yet to solve.
He's pushed the climate debate beyond what Clinton is comfortable with.
Ethiopian farmers innovate to fight drought -- and win big.