Mayors of more than 7,400 cities across the world have vowed that Donald Trump’s decision to withdraw from the Paris accord will spur greater local efforts to combat climate change.



At the first meeting of a “global covenant of mayors”, city leaders from across the US, Europe and elsewhere pledged to work together to keep to the commitments made by Barack Obama two years ago.

Cities will devise a standard measurement of emission reductions to help them monitor their progress. They will also share ideas for delivering carbon-free transport and housing.

Kasim Reed, the mayor of Atlanta, told reporters he had travelled to Europe to “send a signal” that US states and cities would execute the policies Obama committed to, whether the current White House occupants agreed or not.

“Right now you have a level of collaboration and focus and sharing of best practices that I haven’t seen. I came from Brussels from a meeting of the US conference of mayors ... and more than 300 mayors signed a letter reflecting our will to deliver the Paris accord commitments.”

He added: “My firm belief is that President Trump’s disappointing decision to withdraw from the agreement will actually have the opposite effect in terms of execution.

The European commissioner Maroš Šefčovič, who along with the UN’s special envoy for cities and climate change, Michael Bloomberg, co-chairs the board of the new organisation, conceded that it as yet it lacked any members from China, although he said he was confident that this would change.

“Now is the time to join hands,” he said.

Reed, whose administration has promised that the city of Atlanta will use 100% renewable energy by 2035, said 75% of the US population and GDP lay in urban areas, where local leaders were committed to fighting climate change. “We have the ability to still achieve between 35% and 45% CO2 emission reductions without the involvement of the national government and it is why I chose to be here at this time to send a signal to 7,400 cities around the world that now should be a time of optimism, passion and action,” he said.

The mayor of Vancouver, Gregor Robertson, said mayors needed to be proactive and work together on ideas or face huge extra costs in rebuilding their infrastructure to deal with the changing climate. “The Trump administration better watch out for US cities,” he said. “They are on the rise, and I think will prevail in the end, turning the tide, and making sure the US is a climate leader rather than what is happening currently.”

Šefčovič warned Washington that Europe was not willing to renegotiate the terms of the Paris agreement, and would bypass the White House if necessary. “I have to say that now we have to be very pragmatic,” he said. “We work very closely with the states like California, like Washington, like New York and many others, and have a strong alliance … We are not going to renegotiate the Paris agreement. Now is not the time to negotiate, it is time to implement.”

The first meeting of the group of mayors came after Bloomberg announced on Monday an investment of $200m over the next three years in US cities able to illustrate a commitment to reducing emissions. Every American city with at least 30,000 residents is being asked to compete for cash that can be used to test ideas and fund training sessions for municipal staff.

Addressing the European parliament in Brussels on Tuesday, Bloomberg said: “It’s important for you, and the world, to understand that the fate of America’s Paris pledge does not lie with Congress or the White House.

“Few people realise it, but the US is already halfway to our goal of a 26% reduction in emissions by 2025 – and Washington has had almost nothing to do with that progress. Cities, states, businesses, and citizens, together with the market, were responsible for it. None of those groups are slowing down now – and my foundation is working to help each group accelerate its progress.”