Most of the increase of the concentration of carbon dioxide in the atmosphere is attributed to the combustion of fossil fuels, but about a third is thought to have come from deforestation.
(Most of the increase of the concentration of carbon dioxide in the atmosphere; is attributed; to the combustion of fossil fuels) (about a third; is thought; ) (about a third; to have come; from deforestation)
Most of the increase of the concentration of carbon dioxide in the atmosphere about a third about a third
is attributed is thought to have come
to the combustion of fossil fuels
from deforestation