SORU: aşağıdaki parçaya göre cevaplayınız
According to the passage, although atmospheric carbon dioxide levels continue to rise, ----.
The concentrations of methane (CH4) and carbon
dioxide (CO2) gases in the atmosphere have both
risen dramatically since the start of the Industrial
Revolution. However, unlike its more familiar
greenhouse-gas cousin, atmospheric methane has
recently stopped increasing in abundance. This
development wasn't entirely unanticipated, given that
the rate of increase has been slowing for at least a
quarter-century. The recent stabilization of methane
levels is something that some scientists are trying
very hard to explain. Methane has many sources.
Some are natural, such as wetlands and plants, and
some are the consequences of modern society, such
as landfills and wastewater treatment. Methane is
destroyed principally by its reaction with the hydroxyl
radical (OH) in the lower atmosphere. One theory
about the stabilization of methane levels is that
deforestation has reduced the number of plants
contributing to atmospheric methane. Another idea is
that an increase in the prevalence of tropical
thunderstorms may have raised the amounts of the
various nitrogen oxides high in the atmosphere.
There, these gases have the side effect of boosting
the production of OH, which in turn acts to destroy
methane.