responsive to price signals placed on emissions. In 2020 it was estimated that by 2022 replacement of all existing coal-fired power stations by renewables and storage would be profitable in total but that "A key barrier to accelerating phaseout is that the vast majority (93 percent) of global coal plants are insulated from competition from renewables by long-term contracts and noncompetitive tariffs". See also European Green Deal Green economy Green growth Green New Deal Impact of the COVID-19 pandemic on the environment Just Transition Politics of global warming Timeline of sustainable energy research 2020–present Notes References Climate change policy Low-carbon economy Coal phase-out Sustainable energy Responses to the COVID-19 pandemic 2020s in the environment