Famed husband and wife photo duo interpret the interplay between culture and environment

Small gains in energy efficiency can create huge savings. So why isn't everyone doing it?

A short selection from one of our favorite photographers

A sticky and cozy Christmastime treat, from Jennifer Reese

Bill McKibben's LA Times op-ed laments the influence of corporate donations on lawmakers

Legislative delay means there's time for revisions

Incredible close-up images of agate crystals show off nature's art skills