For the third summer in a row, the leaves of the city’s horse chestnut trees are covered in brown spots and turning brown. In another few weeks they’ll shrivel up, die, and fall prematurely. According to one source, this is caused by the larvae of a leaf miner moth. Others say it’s the heatwave or even salt (although there’s not enough snow in Paris to need lots of salt). Supposedly the trees won’t die, but it sure looks butt ugly.