Cities around the world were turning off their lights Saturday for Earth Hour, with this year’s event highlighting the link between the destruction of nature and increasing outbreaks of diseases such as COVID-19.In London, the Houses of Parliament, London Eye Ferris wheel, Shard skyscraper and neon signs of Piccadilly Circus were among the landmarks flicking the switches for one hour starting at 8:30 p.m. local time.“It’s fantastic news that Parliament once again is taking part in Earth Hour, joining landmarks across the country and the world to raise awareness of climate change,” said Lindsay Hoyle, speaker of the House of Commons.“It shows our commitment to improving sustainability … and that we’re playing our part in reducing energy consumption,” he said.In Paris, the three stages of the Eiffel Tower progressively went dark, but there were few people to watch with the whole country under a 7 p.m. COVID-19 curfew.The giant metal …