President Donald Trump has rolled back stringent environmental regulations on hydrofluorocarbons to reduce costs for US businesses and consumers.The Environmental Protection Agency is relaxing leak repair requirements and extending compliance deadlines for industries relying on these potent greenhouse gases.While supporters claim this saves 2.4 billion US dollars, environmental groups warn it will accelerate climate change and harm the competitive edge of US firms in green technology markets.This decision reverses previous cooling efficiency standards and serves as a major shift in the current administration's stance on industrial climate policies.