Their study, published in the journal *Geophysical Research Letters*, shows that the threshold theory, used to study Earth's ...

A report detailing how climate inaction will consign people born today to a lifetime of weather extremes must awaken a sense of responsibility.

Mysterious “leopard spots” on a Martian rock could be evidence of extraterrestrial life—or of mere lifeless chemistry. Finding out the truth may require bringing the rock back to Earth ...