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The Trump administration has criticized and censored guidance from the Centers for Disease Control and Prevention (CDC) and has claimed, without evidence, that the Food and Drug Administration (FDA) is intentionally slowing vaccine testing to hurt his re-election chances. Trump has moved to pull the United States out of the 2015 Paris climate treaty, rolled back a suite of regulations intended to reduce greenhouse-gas regulations and called global warming a hoax. Addressing the demands of an increasingly vocal liberal base, his US$2-trillion plan calls for massive investments in clean-energy research and development and low-carbon infrastructure, such as in public transport and energy-efficient buildings. Biden has said he will have the United States rejoin the Paris climate accord, making the country an active partner of the more than 190 nations that have committed to limiting global warming to 1.5-2 °C above pre-industrial levels.