Because comets contain large amounts of water and other ices, the notion that bombardments by comets deposited much of Earth's water has seemed to be almost a measure of faith. But a variety of recent studies place this idea into a somewhat harsh context.
On May 11, a group of children will face off against the Obama administration and the NAM, arguing that common law requires governments to protect critical natural resources on behalf of current and future generations.
Rowland was a scientific and environmental hero. But as the Times notes, he demurred from that label -- he just thought he was doing what he had to do, given what he'd learned. Everyone alive can thank him for that.