Analysis of information sources in references of the Wikipedia article "Greenhouse gas" in English language version.
The burning of coal, natural gas, and oil for electricity and heat is the largest single source of global greenhouse gas emissions.
Carbon dioxide's lifetime cannot be represented with a single value because the gas is not destroyed over time, but instead moves among different parts of the ocean–atmosphere–land system. Some of the excess carbon dioxide is absorbed quickly (for example, by the ocean surface), but some will remain in the atmosphere for thousands of years, due in part to the very slow process by which carbon is transferred to ocean sediments.
The concentration of methane in the atmosphere is currently over two-and-a-half times greater than its pre-industrial levels
The burning of coal, natural gas, and oil for electricity and heat is the largest single source of global greenhouse gas emissions.