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The diagram shows how greenhouse gases trap the energy from the Sun and the human activities that make this problem worse.
Overall, some of the Sun's energy is reflected back into space, but some of the heat is trapped by greenhouse gases in the atmosphere. Human activities such as burning fossil fuels and cutting down trees increase the amount of carbon dioxide, which is a greenhouse gas.
First, energy from the Sun travels towards the Earth. Some of this energy is reflected off the atmosphere and goes back into space. The rest of the energy reaches the surface of the Earth and heats it. After that, the Earth sends some heat energy back into space.
However, not all of the heat can go back into space. Some of it is trapped by greenhouse gases and goes back down to the Earth, so the Earth becomes warmer. The diagram also shows that vehicles such as trucks and cars, and factories, produce extra carbon dioxide because they burn fossil fuels. In addition, people cut down trees, which absorb carbon dioxide, so there is more carbon dioxide in the atmosphere.