What are the greenhouse gases?

 The greenhouse gases are carbon dioxide, ozone, CFCs, methane, and nitrous oxide.

Many greenhouse gases are natural gases. Carbon dioxide is produced by cars, burning fossil fuels, and all humans and animals breathe it out. Ozone is in the atmosphere, CFCs come from aerosols (spray cans), and methane comes from decomposing organic matter (rotting food, or grass, etc) and cow farts!

Extra greenhouse gases are produced through pollution. One of the ways that humans pollute the atmosphere is through extra animal waste, burning too many fossil fuels (coal, gas), using our cars a lot, or  cutting down rain forests  (because plants use carbon dioxide to make food so if you cut down forests, you take away lots of the plants that would take in the carbon dioxide).

the green bit is what is left of one of the rainforest and the rest is how much they have cut down.