Global warming potential defined

Hydrocarbons (predominantly, NG) are likely to play a major role in hydrogen production in the near- to medium-term future. However, hydrocarbons significantly contribute to anthropogenic C02 emissions into the atmosphere. Spath and Mann [11] estimated that the global warming potential (GWP) of hydrogen production by the SMR process is 13.7 kg C02 (equiv.) per kg of net hydrogen produced. GWP is defined as a combination of C02, CH4, and N20 emissions expressed as C02 equivalence for a 100-year time frame. 

To evaluate the impact of different greenhouse gases, the IPCC introduced the global warming potential [8c[ (GWP), which is a quantified measure of the impact of each gas compared to carbon dioxide, used as a reference, in a defined time and per unit of mass. The relationship between gigagrams of gas and teragrams of equivalent CO2 is the following ... 

The IPCC defines global warming potential as follows [6] ... 

Global warming potential of a well-mixed gas is defined as the time-integrated commitment to radiative forcing from the instantaneous release of 1 kg of trace gas expressed relative to that from the release of 1 kg of C02. 

While the economic compartment is easily defined by a cost-profit relationship, the correlation with the ecological compartment is difficult because we deal with several very different aspects, such as global warming potential, and different aspects may have different importance under different situations (smog in California or eutrophication of the Caspian sea). 

The LCA analysis first performs an inventory analysis that involves data collection and calculation procedures to quantify relevant inputs and outputs of the entire system defined within the system boundaries. This inventory is followed by an environmental impact assessment, which quantifies and categorises the inventory analysis results into environmental impacts. For demonstration purposes. Table 1 shows a list of the inventory emissions to air and the impact analysis of these emissions. The impact analysis step converts the inventory results into equivalents of a selected reference substance for each impact category such as emitting 1kg of methane is equivalent to 11kg of CO2 for global warming potential and 1kg of HF is equivalent to 1.6kg of SO2 for acidification. 

LCA can be used to compare the sustainability of bottles made from PLA, 100% recycled PET, and virgin PET. The sustainability will be evaluated with criteria defined in Chapter 3 as reductions in global warming potential, reductions in waste, and reductions in pollution. 

In a similar way, the Global Warming Potential (GWP) is defined, also related to the effect of 1kg of CFCll [387]. 

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