Report: Time to mull cooling the planet

Associated Press

WASHINGTON

It’s time to study and maybe even test the idea of cooling the Earth by injecting sulfur pollution high in the air to reflect the sun’s heat, a first-of-its-kind federal science report said Tuesday.

The idea was once considered fringe — to purposely re-engineer the planet’s climate as a last-ditch effort to battle global warming with an artificial cloud. No longer.

In a nuanced, two-volume report, the National Academy of Sciences said that the concept should not be acted upon immediately because it is too risky, but it should be studied and perhaps tested outdoors in small projects.

It could be a relatively cheap, effective and quick way to cool the planet by mimicking the natural effects on climate of large volcanic eruptions, but scientists concede there could be dramatic and dangerous side effects that they don’t know about.

Because warming has worsened and some countries might act unilaterally, scientists said research is needed to calculate the consequences.