Usually carbon dioxide given off from respiration and the carbon dioxide used by photosynthesis are in balance, but the burning of so many fossil fuels (coal, gas, gasoline) is causing an increase in the release of carbon dioxide.
(carbon dioxide; given off; ) (the carbon dioxide; used; by photosynthesis) (the burning of so many fossil fuels; is causing; an increase in the release of carbon dioxide)
carbon dioxide the carbon dioxide the burning of so many fossil fuels
given off used is causing
by photosynthesis
an increase in the release of carbon dioxide