Scorched Earth

By ROBERT L. PARK

College Park, Md.

NASA has quietly terminated the Deep Space Climate Observatory, citing "competing priorities." The news media took little notice. Few Americans, after all, had even heard of the program. But the entire world may come to mourn its passing.

Earth is growing warmer. Even the most strident global-warming deniers have taken to saying that a little warming is a good thing. If the trend continues, however, it will have catastrophic consequences for life on this planet. Correctly identifying the cause could be the most important problem facing humanity.

Most scientists link global warming to unrestrained burning of fossil fuels, which shrouds Earth in a blanket of carbon dioxide, trapping the Sun's energy. Others, backed by industries that spew pollutants into the atmosphere, insist that greenhouse emissions are not the problem. They prefer to attribute warming to natural variations in solar output. Scientists are skeptical, but they don't deny the possibility. The issue cries out to be resolved.