Modeling the Greenhouse Effect In this activity, you will model the greenhouse effect by graphing air temperature over time. Estimated time to complete: 1 hour You will need these materials: 2 empty two-liter plastic bottles (or 2 clear plastic containers, similar in size), rinsed 2 thermometers (not mercury) that will each fit inside a bottle a lamp with a 150-watt incandescent bulb (if direct sunlight is not available) a measuring cup soil (4 cups) a roll of plastic wrap a scissors or utility knife clear tape 1 rubber band 6-8 ice cubes (all the same size)