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The table below includes entries for popular substances already used for their energy, or being discussed for such use. The second column shows specific energy , the energy content in megajoules per unit of mass in kilograms , useful in understanding the energy that can be extracted from the fuel.
The following table lists the annual CO 2 emissions estimates (in kilotons of CO 2 per year) for the year 2023, as well as the change from the year 2000. [4] The data only consider carbon dioxide emissions from the burning of fossil fuels and cement manufacture, but not emissions from land use, land-use change and forestry.
Consumption-based emissions = Production-based – Exported + Imported emissions [14] This is measured as the net import-export balance in tons of CO 2 per year. Positive values represent netimporters of CO 2. Negative values represent net exporters of CO 2. [15] The data in the following table is extracted from Our World in Data database. [16]
Some coal-fired power stations may operate for 50 years but others may be shut down after 20 years, [18] or less. [19] According to one 2019 study considering the time value of GHG emissions with techno-economic assessment considerably increases the life cycle emissions from carbon intensive fuels such as coal. [20]
The emissions information in eGRID include carbon dioxide (CO 2), nitrogen oxides (NO x), sulfur dioxide (SO 2), mercury (Hg), methane (CH 4), nitrous oxide (N 2 O), and carbon dioxide equivalent (CO 2 e). CO 2, CH 4, and N 2 O are greenhouse gases (GHG) that contribute to global warming or climate change.
For example, methane has a GWP over 20 years (GWP-20) of 81.2 [2] meaning that, a leak of a tonne of methane is equivalent to emitting 81.2 tonnes of carbon dioxide measured over 20 years. As methane has a much shorter atmospheric lifetime than carbon dioxide, its GWP is much less over longer time periods, with a GWP-100 of 27.9 and a GWP-500 ...
Californian Governor Arnold Schwarzenegger issued Executive Order S-1-07 on January 19, 2007, to enact a low-carbon fuel standard (LCFS). [14] [15] The LCFS requires oil refineries and distributors to ensure that the mix of fuel they sell in the Californian market meets the established declining targets for greenhouse gas (GHG) emissions measured in CO 2-equivalent grams per unit of fuel ...
It will save about 887,000,000 U.S. gallons (3.36 × 10 9 L) of fuel and reduce carbon dioxide emissions by 8.3 million metric tons. This 2011 single-year standard will use an attribute-based system, which sets fuel economy standards for individual vehicle models, based on the footprint model.