![60-Second Space show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/030/805/small/60-second-space.jpg)
Summary: Global 3-D climate simulations for plausible Martian atmospheres show that even with a much thicker CO2 layer, the greenhouse effect could not have warmed Mars above freezing. John Matson reports.
Summary: Global 3-D climate simulations for plausible Martian atmospheres show that even with a much thicker CO2 layer, the greenhouse effect could not have warmed Mars above freezing. John Matson reports.