Carbon dioxide as a greenhouse gas

Landfill gas is produced as a result of organic wastes decomposing in landfill sites. It can be recovered at an inexpensive cost of for direct use as a boiler fuel, converted into electricity with a microturbine or upgraded to a higher value fuel gas. This is a very effective mitigation technology since methane is 21 times as powerful as carbon dioxide as a greenhouse gas. 

Developing catalysts for the complete 12-electron oxidation of ethanol. Such catalysts are needed for efficient utilization of biofuels in fuel cells producing electric power, which, in the final analysis, is derived from solar energy, involving consumption (rather than liberation) of carbon dioxide as a greenhouse gas. 

This was previously done using methylene chloride (CH2CI2) which also removes some flavor and aroma components from the beans. Methylene chloride is toxic and even trace quantities in the extracted beans are undesirable. While carbon dioxide is a greenhouse gas, no new CO2 needs to be created in order to employ it as a solvent. NASA, noting that 95 percent of the Martian atmosphere is CO2, is even contemplating recovery of fuels such as magnesium from the Martian surface using supercritical CO2. 

The combustion of fossil fuels such as octane (shown here) produces water and carbon dioxide as products. Carbon dioxide is a greenhouse gas that is believed to be responsible for global warming. 

The combustion of methane is a very exothermic reaction and so methane is widely used as a fuel, not least because the volatile and non-toxic products make it clean , though one product, carbon dioxide, is a greenhouse gas . 

Supercritical fluids also find application in the areas of pollution prevention and remediation, and supercritical carbon dioxide is used as a replacement solvent for many hazardous solvents in both extraction and separation processes and also as a reaction medium and in materials processing. Although carbon dioxide is considered as a greenhouse gas , there is actually no net increase in the amount of the gas if it is removed from the environment, used as the solvent instead of a hazardous substance, and returned to the environment. In this way, most of the uses of supercritical carbon dioxide may be considered as environmentally friendly. Because the solubilities of oils and greases in carbon dioxide are high, it is particularly suited to the cleaning of machinery 47 and, as discussed in the literature 48, it is used as a solvent in textile dyeing operations where it is used to treat any dye-laden... 

Experimentation with the catalytic reduction of carbon dioxide has stemmed from several important factors. Its presence as a greenhouse gas within the atmosphere has led to the need to find effective methods to lower its concentration. Also, as... 

It should be noted that carbon dioxide is classified as a greenhouse gas responsible for global warming. At the present time there are no restrictions on its use for aerosols and other applications. 

While biomass generally involves the burning of material it differs from fossil fuels in that no more heat or carbon dioxide is produced than would be produced by natural processes. As such, it is referred to as carbon neutral. However, it still produces CO2 and a range of other pollutants including nitrogen oxides, ash, but virtually no SO2. A further environmental benefit is that the combustion of landfill gas avoids accidental explosions and prevents the release of methane, which is more potent as a greenhouse gas. 

Changes in the amount of carbon dioxide closely track the temperature changes inferred over the past 150,000 years. So does methane, which is 20-30 times more potent as a greenhouse gas than C02. 

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