1 Through this incision, the abdominal cavity is distended with carbon dioxide gas.
2 The increased use of natural gas will help reduce carbon dioxide emissions.
3 The emission of gases such as carbon dioxide should be stabilised at their present level.
4 Sulphur dioxide is the main precursor of acid rain.
5 Trees absorb carbon dioxide and produce oxygen.
6 Plants and trees filter carbon dioxide out of the air and produce oxygen.
7 The lime water has turned cloudy, therefore carbon dioxide has been produced during the experiment.
8 Our ancestors started adding the greenhouse gas carbon dioxide principally by cutting down trees for farming; whereas methane production started with wet farming of rice.
9 Carbon dioxide emissions from the burning of fossil fuels will produce a 3 percent reduction in the density of Earth's outermost atmosphere by 2017.