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  2. Climate change policy of California - Wikipedia

    en.wikipedia.org/wiki/Climate_change_policy_of...

    As the most populous state in the United States, [1] California's climate policies influence both global climate change and federal climate policy. In line with the views of climate scientists, the state of California has progressively passed emission-reduction legislation. California has taken legislative steps in the hope of mitigating the ...

  3. Carbon footprint - Wikipedia

    en.wikipedia.org/wiki/Carbon_footprint

    The carbon footprint explained Comparison of the carbon footprint of protein-rich foods [1]. A formal definition of carbon footprint is as follows: "A measure of the total amount of carbon dioxide (CO 2) and methane (CH 4) emissions of a defined population, system or activity, considering all relevant sources, sinks and storage within the spatial and temporal boundary of the population, system ...

  4. Greenhouse gas emissions by the United States - Wikipedia

    en.wikipedia.org/wiki/Greenhouse_gas_emissions...

    The United States produced 5.2 billion metric tons of carbon dioxide equivalent greenhouse gas (GHG) emissions in 2020, [6] the second largest in the world after greenhouse gas emissions by China and among the countries with the highest greenhouse gas emissions per person. In 2019 China is estimated to have emitted 27% of world GHG, followed by ...

  5. Net-zero emissions - Wikipedia

    en.wikipedia.org/wiki/Net_zero_emissions

    The idea of net zero came out of research in the late 2000s into how the atmosphere, oceans and carbon cycle were reacting to CO 2 emissions. This research found that global warming will only stop if CO 2 emissions are reduced to net zero. [18] Net zero was basic to the goals of the Paris Agreement.

  6. List of U.S. states and territories by carbon dioxide emissions

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    This is a list of U.S. states and territories by carbon dioxide emissions for energy use, [1][2] as well as per capita [3][4] and by area. [5] The state with the highest total carbon dioxide emissions is Texas and the lowest is Vermont. The state with the highest per capita carbon dioxide emissions is Wyoming and the lowest is New York.

  7. Representative Concentration Pathway - Wikipedia

    en.wikipedia.org/wiki/Representative...

    RCP 2.6 is a "very stringent" pathway. [4] According to the IPCC, RCP 2.6 requires that carbon dioxide (CO 2) emissions start declining by 2020 and go to zero by 2100.It also requires that methane emissions (CH 4) go to approximately half the CH 4 levels of 2020, and that sulphur dioxide (SO2) emissions decline to approximately 10% of those of 1980–1990.

  8. Sustainability at American colleges and universities - Wikipedia

    en.wikipedia.org/wiki/Sustainability_at_American...

    Some universities, such as the University of California, approach sustainability from a leisure perspective. UC encourages bicycle riding by providing students with maps and directions for safe bike routes to popular destinations in the area. The college also auctions off abandoned bikes every semester to encourage bike use even more. [39]

  9. Regulation of greenhouse gases under the Clean Air Act

    en.wikipedia.org/wiki/Regulation_of_greenhouse...

    These six greenhouse gases are: carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N 2 O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF 6). These greenhouse gases in the atmosphere constitute the "air pollution" that threatens both public health and welfare. 2) The Cause or Contribute Finding, in which the ...