How Earth Avioded the Cold Fate of Mars

This article states that the carbon dioxide present on earth prevented it from freezing over. Researchers have analyzed the world's oldest sedimentary rocks and found that CO2 likely kept the planet's temperature above freezing. The rocks found near Hudson Bay in northern Quebec showed that high concentrati0ns of carbon dioxide allowed the atmosphere to keep more heat than Mars. Maybe we should complain less about the greenhouse effect... it saved our planet billions of years ago.