Health claims describe a relationship between a food substance (a food, food component, or dietary supplement ingredient), and reduced risk of a disease or health-related condition.ealth claims describe a relationship between a food substance (a food, food component, or dietary supplement ingredient), and reduced risk of a disease or health-related condition.
Burning carbon requires oxygen (O2), and when we burn an atom of carbon, the required oxygen becomes part of the CO2 molecule. So if the CO2 increase is caused by burning carbon (fossil fuels), we would expect atmospheric O2 levels to decrease at the same rate. And that's indeed what we observe (Figure 1).
Causes for rising emissions. 1  Burning coal, oil and gas produces carbon dioxide and nitrous oxide. 2  Cutting down forests (deforestation). Trees help to regulate the climate by absorbing CO2 from the atmosphere. 3  Increasing livestock farming. Cows and sheep produce large amounts of methane when they digest their food.