Burning rainforests are the source for about 20% of the carbon dioxide released each year.
(Burning rainforests; are; the source for about 20% of the carbon dioxide) (the carbon dioxide; released; T:each year) (Burning rainforests; are the source for; about 20 %)
Burning rainforests the carbon dioxide Burning rainforests
are released are the source for
the source for about 20% of the carbon dioxide
T:each year
about 20 %