This year's economic shutdowns have done little to reduce the world's carbon emissions. While pollution has dipped, greenhouse gases keep accumulating in the atmosphere, locking in future decades of climate disruption and extreme weather. A recent United Nations report says the so-called emissions gap - the "difference between where we are likely to be and where we need to be" on climate policy - is as big as ever. As for who's chiefly responsible for the gap, it's the global rich, the report says. Just 10% of the world's population emits nearly half of the world's carbon pollution. The top...