Plant-based milks have a lighter impact than dairy milk in terms of carbon pollution, water and land use — but not all are created equal. Two sustainability researchers crunch the numbers to guide you towards more Earth-friendly options.

US President Joseph R. Biden recently announced ambitious new climate goals. What are the changes needed to reach these new targets? And how will they affect our lives? Climate policy expert Nathaniel Keohane explains.

Growing an ounce of cannabis indoors can produce as much carbon pollution as driving 370 miles! Researchers explain why it’s so energy-intensive — and what we need to know in order to cultivate it more sustainably.