Just how do greenhouse gases change the climate? Select the level of atmospheric greenhouse gases during an ice age, in the year 1750, today, or some time in the future and see how the Earth's temperature changes. Add clouds or panes of glass; Sample Learning Goals •Describe what happens to the temperature, sunlight, and infrared photons as you change the concentration of greenhouse gases. •Explore the differences between the ice age and today. •What happens when clouds are present? •Explain why the temperature increases as the concentration of greenhouse gases increases.