Maybe I had no fun when I finally found a "CO word" ! Now I know that the climate change is due to these two letter word followed by the n° 2.
The world has to reduce their CO2 emissions, otherwise we will all die. Not immediately of course, it also depends on your age. Anyway we should walk more, drive less, heat less and live GREEN whatever that means.
As pictures are better then words here are some explanations :