By Marlene Cimons
This is one flying insect you don't want to swat. It doesn't bite, sting or spread disease. In fact, someday it could be a life- and climate-saver. In time, it could even be used to survey crops, detect wildfires, poke around in disaster rubble searching for survivors and sniff out gas leaks, especially global warming-fueling methane, a powerful greenhouse gas many times more potent than carbon dioxide.