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The Speed Sweet Spot

ExplainerUnited StatesBrian Palmer

Not too fast, not too slow—how driving speed and free-flowing traffic can lower the carbon emissions from our tailpipes.

Not-So-Vacant Lots

DispatchNew Orleans, LouisianaAlisa Opar
From birds to trees to rats, post-Katrina New Orleans is a study in “disaster ecology.”

Northward Ho!

Latest NewsArctic, AlaskaAlisa Opar
Obama is headed to the Arctic. Here are five things the president should put on his must-do-in-Alaska list.