CNN  —  High above Earth, a cutting-edge satellite is zooming around the planet 15 times a day. It is hunting for leaks of methane — an invisible, super-polluting gas that is dramatically warming the planet. Its measurements are precise enough to plot heatmaps of the biggest offenders, lighting up all the places they are venting the gas into the atmosphere at a staggering rate, unbeknownst to regulators, as the planet careens toward what scientists warn could be irreversible climate change