ocr: t9 - ) - MARS AND EARTH: A COMPARATIVE HISTORY FHE SEARCIE FO The problem of Mars (cont.) On Mars, carbon dioxide became the principal component in the increasingly thin atmosphere. The greenhouse effect was reduced and temperatures once again dropped below the freezing point, while the atmospheric pressure diminishing accordingly. Today, in the winter, in the polar regions of the Red Planet, carbon dioxide forms frozen caps. These then retum to the gas state in the spring, raising the local atmospheric pressure; this phenomenon engenders important atmospheric disturbances. This is, notably, t ...
