 You know what I'm saying? Yeah, oh yeah. The American farm belt might be too dry and the wheat and corn crops would have to move to Canada. Scientists blame the odorless, colorless carbon dioxide gas for these potentially dangerous changes around the planet. It is the greenhouse effect. The gas allows sunlight to filter down and warm the earth. But like the glass of a greenhouse, the carbon dioxide tends to trap heat so that it cannot rise into space. Okay, so you're just going along with this report.