MIAMI: Fierce hurricanes, heat waves, floods and wildfires ravaged the planet in 2017, as scientists said the role of climate change in causing or worsening certain natural disasters has grown increasingly clear, reports AFP.

It was also the year the world’s second largest polluter, the United States, turned its back on the 196-nation Paris climate deal meant to limit global warming to under two degrees Celsius (1.5 degrees Fahrenheit) over pre-industrial levels.

President Donald Trump, who has dismissed global warming as a Chinese hoax, vowed to quit the 2015 Paris accord and tapped fossil fuel allies to key environmental posts.

His administration also dropped climate change from the list of national security threats, announced plans to auction off vast swaths of the Gulf of Mexico to oil and gas drilling, and signed a proposal to eliminate the Clean Power Plan, aimed at limiting the release of polluting greenhouse gases.

Trump says the goal is to make America a dominant source of energy for the world, and to create jobs.

“Together, we are going to start a new energy revolution—one that celebrates American production on American soil,” Trump said in June.

In October, Trump signed a proclamation to make America a net energy exporter by 2026, reviving the coal industry and seeking to access the estimated $50 trillion in untapped shale, oil, and natural gas reserves, particularly on federal lands.

While the fossil fuel industry has applauded the moves, scientists have expressed alarm.

“The Trump administration, in less than a year, has done more to undermine climate policy than even the worst previous administration on climate (i.e. George W Bush) had done over the course of two full terms,” said Michael Mann, a climatologist and geophysicist at Pennsylvania State University, in an email to AFP.

Mann blamed the conservative billionaire Koch brothers and fossil fuel lobbyists for essentially running US environmental policy under the Trump administration.

“They must be stopped,” he added, because their actions “pose an existential threat to us and our children and grandchildren.”