From a Chemistry perspective it is the electron at 1/1800th the mass of a proton or neutron.
The various atomic masses of the same element are called<u> isotopes</u>. They have the same number of protons but different number of neutrons.
Human activities contribute to climate change by causing changes in Earth's atmosphere in the amounts of greenhouse gas- es, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere.
