In a typical power plant, coal is burned to generate high pressure steam that passes through a steam turbine. The turbine turns a generator to make electricity. Other technologies can also be used to turn coal into electricity. But in all cases, the main byproducts of combustion are carbon dioxide and water vapor, which escape into the atmosphere. But with the right technology, carbon dioxide can be separated out, resulting in emissions of mostly water. The captured CO2 can then be compressed to a high enough pressure that it behaves like a liquid, and put into a pipeline for transport to a suitable underground storage site.