Changes

All living creatures [[respiration|respire]] and produce [[Carbon Dioxide]]. If there was no [[photosynthesis]] the amount of [[Carbon Dioxide]] in the [[atmosphere]] would increase and the amount of [[Oxygen]] in the [[atmosphere]] would decrease.

Before humans started [[Combustion|burning]] [[Fossil Fuel|fossil fuels]] [[photosynthesis]] and [[respiration]] kept the amount of [[Carbon Dioxide]] in the [[atmosphere]] constant but now that we burn [[Fossil Fuel|fossil fuels]] the amount of [[Carbon Dioxide]] is increasing.