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Methane (CH 4), which causes 4–9 percent;Main Greenhouse Gases Multiple gases contribute to the greenhouse effect that sets Earth's temperature over geologic time Small changes in the atmospheric concentration of these gases can lead to changes in temperature that make the difference between ice ages when mastodons roamed the Earth, and the sweltering heat in which the dinosaurs lived keeling curve graphic CO2 traps twothirds of the heat retained on the Earth's surface by greenhouse gases, and this warming effect has increased by 45% since 1990 Greenhouse Effect Diagram Images Stock Photos Vectors Shutterstock What is greenhouse gas and its effect