Both Los Angeles and its only rival for the 2024 Olympic and Paralympic Games, French capital Paris, have pledged sustainability issues as a key part of their respective bids.

The Agreement, signed in 2015, required each signatory country to determine its own contribution it should make in order to mitigate greenhouse gas emissions.

It was presented as a key means to bring all nations together to meet collective targets to combat global warming.

The US now joins Syria and Nicaragua as the only countries to have rejected the agreement.

Trump is hoping to negotiate a new deal which would better better benefit American workers.

Garcetti, a Democrat, has frequently opposed Trump's Republican administration since it took power in January. 

"Climate change is a fact of life that people in Los Angeles and cities around the world live with every day," Garcetti said in a statement.

"It is a grave threat to our health, our environment, and our economy - and it is not debatable or negotiable.

"This is an urgent challenge, and it’s much bigger than one person. 

"With the President pulling out of the Paris Climate Agreement, LA will lead by committing to the goals of the accord - and will work closely with cities across America and the world to do the same."

Garcetti is a co-founder of the "Mayors National Climate Action Agenda" which has supported adopting the resolutions of the Paris Agreement in their respective cities across the country.

It is unclear whether many voting International Olympic Committee (IOC) members would be affected by Trump's decision, but sustainability is a central plank of the Agenda 2020 reforms introduced by President Thomas Bach in 2014.

Jeff Immelt, chairman and chief executive of General Electric, a member of the IOC's The Olympic Programme (TOP) sponsorship scheme, was among others to criticise the decision on social media.

"Disappointed with today’s decision on the Paris Agreement," he tweeted. 

"Climate change is real. 

"Industry must now lead and not depend on Government."

Yiannis Exarchos, chief executive of Olympic Broadcasting Services, also posted: "I have a feeling that this may prove to be a pivotal moment in US history...

"It's not a good feeling."

Paris Mayor Anne Hidalgo and French President Emmanuel Macron also criticised the decision.

Hidalgo warned Trump has made a "dramatic mistake".

Macron took the unusual step of speaking in English from the steps of the Elysée Palace, claiming he thought it was an "actual mistake both for the US and for our planet".

Paris 2024 have particularly heralded sustainability building on the success of the Paris Agreement as a key part of their bid.

Hidalgo spoke about these issues at length during the city's first bid presentation at the Association of National Olympic Committee General Assembly in Doha in November.

Los Angeles 2024 have been slightly less vocal, but insisted that their bid concept requiring no new venues perfectly embraces sustainability.

They also unveiled a Sustainability and Legacy Committee during last month's Evaluation Commission inspection visit to the city.

It is possible that these recent developments could also impact the ongoing discussions to award both the 2024 and 2028 Olympic and Paralympic Games this year.

Paris is currently thought more likely to land the 2024 edition and  Los Angeles 2028.

Trump is big supporter of the Los Angeles 2024 bid, despite his tense relationship with Garcetti.

Trump is expected to invite Bach to the White House for a meeting over the next few weeks.

An IOC spokesperson told insidethegames there is "nothing concrete as yet" when asked if a date had been proposed.