This would likely increase the cost of electricity, but if global warming proves negligible, the carbon could be removed and used as a fuel at a later time. Those above methods will reduce the amount of CO2 released into the atmosphere but do not remove the CO2 out of the atmosphere. CO2 removal can be done by capturing CO2 directly from the atmosphere by plants or from the flue gases being expelled by power plants and other sources that emit large quantities. After capture takes place, the carbon dioxide must be disposed of or recycled into other fuels. Atmospheric CO2 capture can be done by biological means.
Reforestation is one possibility.
Tree plantations might help counter rising CO2 levels, but this would require huge expanses of land. A seemingly better solution is farming the ocean. Researchers are investigating the feasibility of developing huge, floating farms made of kelp. On top the the kelp, a special type of algae will be attached. The algae will take up CO2 and convert it to calcium carbonate.