Malin Moench: The climate has already changed, and it’s ugly

We have just experienced a monthlong heat wave that shattered records across the American West.Temperatures topped 120 degrees in Los Angeles County. Red flag warnings of extreme fire danger are posted from the Mexican to the Canadian border. Bay Area smoke has been so thick that San Franciscans have had to check their watches to tell whether it is night or day. In Oregon, fire has been consuming entire towns at the rate of three or four per night.These hellish conditions have spawned megafires