Al Gore has cited Donald Trump of circling himself with "the absolute worst of all climate deniers" and stated he's given up attempting to persuade the president to reverse his dismantling of policies combatting global warming.
But, the former US vice-president, both Gore, and Jerry Brown told the Guardian they were confident if Trump is defeated in the presidential election the US will recover its leadership position.
Gore and Bloomberg, the former mayor of New York, are doing a wide coalition of climate change hawks from US countries, cities and businesses in Bonn, where UN climate talks are being held. This alliance is in sharp contrast to the official US delegation, which will be representing the only national government on the planet that doesn't wish to be part of their Paris climate accords.
"I haven't had any discussions with [Trump] since his address to withdraw from Paris. I tried his best and believed he'd come to his senses, but I've been proven wrong," Gore, who met with Trump during the transition to attempt to affect his thinking, told the Guardian. "I really don't believe I have the ability to change his thoughts. He has surrounded himself with the absolute worst of climate deniers who seem to have captured his mind on the problem."
Trump has aligned with Scott Pruitt, the US Environmental Protection Agency's head Who's a critic of the Paris deal. Pruitt has cast doubt on whether carbon dioxide drives global warming, and maintained there is "tremendous debate" among scientists on climate change.
Several former and current members of this administration, including Stephen Bannon and Mick Mulvaney, have also previously disregarded signs for climate science fiction.
Gore, who is now one of the world's top voices on climate change, said other countries are "aghast" in Trump's withdrawal from climate policy but said the reaction both within the U.S. and overseas is hopeful.
"The US states have made a tremendous difference and I think that the response of the rest of the planet has minimized the harm done by Donald Trump," he said. "The response to Trump is if anything stronger than the action Trump is taking.
"This experiment with Trump is under a year old and in mathematics, experiments are sometimes cut short early. That feels like a picture I've seen, although I'm not saying this will happen this time.
"We went off the rails a bit in the previous election. I think that the rest of the planet understands that the Trump interval is an unfortunate departure from what the US is known for when we are at our finest. Those who have acknowledged US leadership mourn its loss and let's hope it is short-lived."
Brown also said he sees little point attempting to sway the Trump government. "The official policy of the US is that climate change is a complete and complete hoax conceived by Chinese conspirators," that the California governor told the Guardian. "That is so ridiculous that engagement on that foundation is merely useless."
The California governor stated mid-term elections from the US following year might pressure position to change. "He is an action orientated individual, not a politician, so who knows," he said.
"Finally we won't have a denier in the White House forever. We're engaged in a great political struggle between the deniers who want to turn over the world to scientists and fossil fuel interests and concerned activists that wish to see decarbonization.
"Donald Trump is a tiny stage in the total climate element. We are currently facing a moment of truth over if we can decarbonize or see.
"We've got a political sidebar we could tweet about. However, the existential problem is that species have been ruined, ecologies are being degraded, and mankind is on the chopping block. This is not the time for politics, but it's the time for courageous action."
Brown has attempted to step in the vacuum made by US withdrawal by holding dozens of events and meetings with national leaders, UN officials and NGOs across Europe.
The governor has caught on a role highlighting the impact of sub-national entities like California, which would have the sixth biggest economy on earth if it had been a country and has implemented a 'cap and trade' emissions trading system that may soon be connected to a similar mechanism utilized by European Union nations.
"I wish to strengthen the coalition of nations and states in order to do everything possible to decrease carbon emissions," Brown stated.
The Bonn talks, which will last until 17th of November are largely in assisting countries implementing the goals of the Paris agreement, where almost 200 countries agreed to limit global warming to 2C above the pre-industrial era an exercise.
Trump has vowed to pull against on the US but under the rules of the pact, he is going to be not able to do this until 2020. In Bonn, the US delegation is expected to follow the lead of their president, a vocal supporter of fossil fuels, by extolling the benefits of "efficient" coal, nuclear energy and natural gas.
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