Answer:
Cars, Overpopulation, Mass logging in forests
Explanation:
These 3 examples help with the rise of CO2 levels. Cars produce C02 in exhaust (this is also polluting earth). Overpopulation means there are more people needing Oxygen and their cells are doing Cellular Respiration to turn that Oxygen into C02 (that we breathe out). cutting down trees takes away our Oxygen supply and it eliminates the process of photosynthesis in those trees