Recent studies have already established a measurable increase in the current concentration of carbon dioxide in the atmosphere which is mainly due to an increase in the combustion of fossil fuels.
(Recent studies; have established; a measurable increase in the current concentration of carbon dioxide in the atmosphere; T:already) (the atmosphere; is mainly; due to an increase in the combustion of fossil fuels)
Recent studies the atmosphere
have established is mainly
a measurable increase in the current concentration of carbon dioxide in the atmosphere T:already
due to an increase in the combustion of fossil fuels