This led to theories that plants could absorb the carbon dioxide, caused by burning fossil fuels, that could be behind the gradual warming of the earth's atmosphere.
(This; led; to theories that plants could absorb the carbon dioxide) (plants; could absorb; the carbon dioxide, caused by burning fossil fuels, that could be behind the gradual warming of the earth's atmosphere) (the carbon dioxide, caused by burning fossil fuels; could be; behind the gradual warming of the earth's atmosphere)
This plants the carbon dioxide, caused by burning fossil fuels
led could absorb could be
to theories that plants could absorb the carbon dioxide
the carbon dioxide, caused by burning fossil fuels, that could be behind the gradual warming of the earth's atmosphere
behind the gradual warming of the earth's atmosphere