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).
1 Second, CO2 is a greenhouse gas. 2  Third, during the last 30 years, global temperatures have been rising. 3  Fourth, the things that ordinary cause temperatures to rise -- such as increased solar activity -- are not causing the current rise in temperature. 4  Therefore, increased C02 is causing global warming.