Mexico City is building huge vertical gardens to help scrub the city’s air of pollution.

In New York City, compost at the giganto Fresh Kills landfill went up in flames, leading to a five-alarm fire.

Oil prices are high enough that energy companies are drilling in the Gulf of Mexico’s shallow waters, an area once considered tapped out.

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A new study says that, on carbon emissions, natural gas does beat coal as a source of electricity — even when methane leaks are accounted for. But as a fuel for vehicles, natural gas produces only questionable carbon benefits.

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The U.N. is pushing countries towards “green accounting,” in which the value provided by natural resources is included in economic calculations.

Tiny kitchens beat big kitchens.