Trump and Greta Thunberg clash at Davos over climate change

Donald Trump hit out at environmental "alarmists" and "prophets of doom" in a thinly-veiled attack on Greta Thunberg on the opening day of the World Economic Forum at Davos. The US president said it is a "time for optimism" as he claimed he was a "big believer in the environment", prompting Thunberg to retort that his climate pledge was "nowhere near enough".
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