How does the Earth Cool Itself Off?

In this activity, learners simulate the energy transfer between the earth and space by using the light from a desk lamp to warm up a world map placemat. The placemat will warm up, so it will emit infrared, which learners can detect with an infrared thermometer. The hotter the surface, the more energy emitted, which the thermometer will show. Then learners will add an "atmosphere" to see how it holds the heat in and reduces the transmission of infrared. This activity also works well outside on a sunny day. Note: the cost of materials does not include the IR thermometer or lamp.