How do Human Activities Contribute to Climate Change
and How do They Compare with Natural Influences?
Human activities contribute to climate change by causing
changes in Earth’s atmosphere in the amounts of greenhouse gases,
aerosols (small particles), and cloudiness. The largest known
contribution comes from the burning of fossil fuels, which releases
carbon dioxide gas to the atmosphere. Greenhouse gases and aerosols
affect climate by altering incoming solar radiation and out-
going infrared (thermal) radiation that are part of Earth’s energy
balance. Changing the atmospheric abundance or properties of
these gases and particles can lead to a warming or cooling of the
climate system. Since the start of the industrial era (about 1750),
the overall effect of human activities on climate has been a warming
influence. The human impact on climate during this era greatly
exceeds that due to known changes in natural processes, such as
solar changes and volcanic eruptions.
Bookmarks