Place the icons in the correct location to create the Earth’s naturally balanced carbon cycle. Select an icon and then select the box where it should go. You can choose a new icon and replace an old one if you need to fix a mistake. Select Submit to see if you’re correct. You can try as many times as you’d like. Once you have the correct cycle in place, you’ll unlock the Global Warming Simulation.

Animal and
plant respiration
Ocean uptake
Factory and
vehicle emissions
Fossils and
fossil fuels