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= Carbon tax = ''Citations appear on the live version of the article. Most but not all of the below text is my original writing (some components have been kept from previous authors.''

Design
The design of a carbon tax involves two primary factors: the level of the tax, and the use of the revenue. The former is based on the social cost of carbon (SCC), which attempts to calculate the numeric cost of the externalities of carbon pollution. The precise number is the subject of debate in environmental and policy circles. A higher SCC corresponds with a higher evaluation of the costs of carbon pollution on society. Stanford University scientists have estimated the social cost of carbon to be upwards of $200 per ton. More conservative estimates pin the cost at around $50.

The use of the revenue is another subject of debate in carbon tax proposals. A government may use revenue to increase its discretionary spending, or address deficits. However, such proposals often run the risk of being regressive, and sparking backlash among the public due to an increased cost of energy associated with such taxes. To avoid this and increase the popularity of a carbon tax, a government may make the carbon tax revenue-neutral. This can be done by reducing income tax proportionate to the level of the carbon tax, or by returning carbon tax revenues to citizens as a dividend.

United States
Estimated effect of a carbon tax on sources of United States electrical generation (US Energy Information Administration) A national carbon tax in the U.S. has been repeatedly proposed, but never enacted. For instance, on July 23, 2018, Representative Carlos Curbelo (R-FL) introduced H.R. 6463, the "MARKET CHOICE Act," a proposal for a carbon tax in which revenue is used to bolster American infrastructure and environmental solutions. The bill was introduced in the House of Representatives, but did not become law.

A number of organizations are currently advancing national carbon tax proposals. To address concerns from conservatives that a carbon tax would grow government and increase cost of living, recent proposals have centered around revenue-neutrality. The Citizens' Climate Lobby (CCL), republicEn (formerly E&EI), The Climate Leadership Council (CLC), and Americans for Carbon Dividends (AFCD) support a revenue-neutral carbon tax with a border adjustment. The latter two organizations advocate for a specific framework called the Baker-Shultz Carbon Dividends Plan, which has gained national bipartisan traction since its announcement in 2017. The central principle is a gradually rising carbon tax in which all revenues are rebated as equal dividends to the American people. This plan is co-authored by (and named after) Republican elder-statesmen James Baker and George Shultz. It is also supported by companies including Microsoft, Pepsico, First Solar, American Wind Energy Association, Exxon Mobil, BP, and General Motors.

= Climate change policy of the United States = However, many Republicans see ways to address the issue of climate change using conservative principles. In 2019, Luntz Global released polling indicating that a majority of Republican voters would support government action on emissions reduction, and worry the GOP's position on climate hurts its standing within young voting blocs. Also in 2019, several Republican legislators broke with the party to advocate taking action on climate change, with market-based solutions rather than traditional regulations. Additionally, groups of younger Republicans began advocacy efforts in favor of a climate policy response, such as Citizens for Responsible Energy Solutions and Young Conservatives For Carbon Dividends (YCCD). republicEn.org is a conservative non-profit in support of a national, revenue-neutral carbon tax.