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Trump is a known climate sceptic who has been vocal in his criticism of global climate action.

Kennedy, who leads the HHS, which oversees the FDA, is a well-known vaccine sceptic who has a history of spreading health information that scientists say is false.

The gritty manner in which she beat world number 10 Emma Navarro in the Miami second round answered some of the sceptics.

But vaccination rates have dropped in some communities in recent decades as a loose network of vaccine sceptics have without evidence questioned the safety and efficacy of the shots.

But critics fret about safety, cost and nuclear waste – it is a sector with sceptics to convince after the disasters at Chernobyl in Ukraine in 1986 and Fukushima in Japan in 2011.