It is quite reasonable to conclude that the increase probably results from the use of carbon fuels, such as coal, oil, and natural gas. One method to begin to enforce the Kyoto Treaty without benefit of ratification by the U.S. Senate is for the Environmental Protection Agency to classify carbon dioxide as a pollutant. It is plant food, and the basic building material of all living things. Plants take in carbon dioxide and water, and with energy from the sun convert it into carbohydrates, proteins, and fats, into leaves, roots, flowers, and fruit. A byproduct of photosynthesis is oxygen.
Animals breathe in oxygen, eat food, and exhale carbon dioxide.
If carbon dioxide is a pollutant, then every animal on earth is a polluter. Every organic molecule in the bodies of plants and animals contains carbon that was once in the atmosphere as carbon dioxide. There are hundreds of scientific studies to show that plant growth is enhanced by increases in atmospheric concentrations of carbon dioxide. Plants grow larger, and more quickly, and are better able to withstand adverse conditions. The Green Revolution that is now feeding large numbers of people on earth is partly due to increasing atmospheric carbon dioxide.