Mars may be changing BBC

Long-term changes, possibly related to a global climatic shift, have been detected on the surface of Mars. High-resolution images of Mars’ south pole show dramatic erosion in its year-round frosty upper layers. Astronomers have also identified a reservoir of carbon dioxide that, if released, could alter the planet completely. The observations “herald a new era in the study of Mars,” says David Paige of the University of California.