Dhaka, Bangladesh — Golam Mostafa Sarder starts every day before dawn, rising from a thin reed mat in the shed that he shares with fifteen roommates. Each has just enough space to lie flat. He dresses ...

Every time a cow burps or passes gas, a little puff of methane wafts into the atmosphere. Each of those puffs coming out of a cow’s plumbing, added together, can have a big effect on climate because ...

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