“Black carbon," the product of incomplete combustion of everything from wood to diesel fuel, isn’t just something you put on Mary Poppins chimney sweeps to make them look picturesque. It also contributes to climate change, and it will turn your lungs into something from an anti-smoking PSA faster than you can ask for just one more spoonful of sugar. The flip side is that we could save a lot of lives with just a little cleanup. A new study by the Stockholm Environment Institute finds that reducing black carbon could save two and a half million lives a year. And …
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