The method of collecting carbon dioxide emissions after the fossil fuel is burned. The burning of fossil fuels produces flue gases, which include CO2, water vapor, sulfur dioxides and nitrogen oxides. In a post-combustion process, CO2 is separated and captured from the flue gases that result from the combustion of fossil fuel. This process is currently in use to remove CO2 from natural gas. The biggest benefit to using this process is that it allows us to retrofit older power plants, by adding a “filter” that helps trap the CO2 as it travels up a chimney or smokestack. This filter is actually a solvent that absorbs carbon dioxide. The solvent can later be heated, which will release water vapor and leave behind a concentrated stream of CO2. Post-combustion carbon capture can prevent 80 to 90 percent of a power plant’s carbon emissions from entering the atmosphere. However, the post-combustion process requires a lot of energy to compress the gas enough for transport.