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COMING CLEAN

Like any big challenge, building a clean energy future requires us to meet lots of little challenges.
Male Anna's hummingbirds become fiercely territorial at the start of the breeding season.
The world's population is unlikely to stop growing this century.
Exploring the red rocks and canyons of the Greater Canyonlands region, perhaps our next national monument?
Rooftop gardens--sometimes called green roofs--are a trendy topping for buildings, but there's a greener option.
We've overhauled the magazine's design, stripping away extraneous elements to focus on what we do best: bring you captivating stories, photos, and illustrations.
Large aggressive non-native species are invading coastal waters off the Southeast U.S. The best way to fight them is with knife and fork.
Meet the man who's trying to get the John Muir Memorial Shelter on the National Register of Historic Places.
How Austin is becoming a solar power mecca.