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 Greenhouse gases warm the planet Scientists know with virtual certainty that increasing greenhouse gas concentrations tend to warm the planet In computerbased models, rising concentrations of greenhouse gases produce an increase in the average surface temperature of the earth over time From 1990 to 19, the total warming effect from greenhouse gases added by humans to the Earth's atmosphere increased by 45 percent The warming effect associated with carbon dioxide alone increased by 36 percent A greenhouse stays warmer than the air outside Instead of cooling off at night, it traps some of the heat inside to keep the plants warm Even in the winter, with no heat source but the Sun on a clear day, a greenhouse stays warmer than the air outside Greenhouse Effect Definition Diagram Causes Facts Britannica Greenhouse effect