On Earth, the activities of human beings such as the burning of massive amounts of fossil fuels (coal, oil, natural gas) are adding carbon dioxide to the atmosphere faster than it can be removed by photosynthesis.
(the activities of human beings such as the burning of massive amounts of fossil fuels; are adding faster; L:On Earth) (it; can be removed; by photosynthesis)
the activities of human beings such as the burning of massive amounts of fossil fuels it
are adding faster can be removed
L:On Earth
by photosynthesis