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Explanations of the picture:
1. Burning down long living forests for landuse changes adds carbon dioxide to the air.
2. Exhaust fumes contain large amounts of CO2.
3. CO2 spreads within the atmosphere.
4. Sun radiation permeates the atmosphere.
5. The sun's radiation heats up the ground and ...
6. ... the warm surface emits long wave heat radition (infrared light).
7. This thermal radiation is taken up by greenhouse gases as CO2 an partially sent back to the surface.
8. The atmospheric layers next to the ground become warmer.
The picture shows you in a simplified way how the greenhouse effect intensifies by the increase of CO2 in the atmosphere.
Originally, the greenhouse effect is a very normal process. Without this effect we would freeze to death.
But by the rise of the CO2 concentration in the lower atmosphere the long wave rays are sent back to earth.
Consequently the temperature on earth rises.
Unter google.de "Treibhauseffekt" -> Bilder findeste noch ein bisschen mehr..