However, things changed drastically when the President Trump Withdrew US form the Paris Climate Accord.
But Mrs May has been criticised for not signing a joint condemnation from France, Germany, and Italy.
Earlier, Governor Andrew Cuomo, California's Governor Jerry Brown and Governor Jay R. Inslee, of Washington, announced the formation of the "United States Climate Alliance", which will encourage other states across the country to continue the policies laid out in the plan.
French President Emmanuel Macron, German Chancellor Angela Merkel and Italian Prime Minister Paolo Gentiloni issued a joint statement saying the agreement can not be "renegotiated since it is a vital instrument for our planet, societies and economies".
Trump's decision would not stop those who feel committed to protecting the planet, she said: "On the contrary, in Germany, in Europe and in the world, we will join forces to take on and successfully tackle big challenges facing humanity".More news: China still treating foreign firms unfairly: European Union group
Both China and the European Union are sending the world a clear signal that there can be "no backsliding" on the Paris climate pact, Juncker said Friday as he opened trade and climate talks with Chinese Premier Li Keqiang in Brussels.
Continuing tirade against both China and India, Trump said, "China will be allowed to build hundreds of additional coal plants".
As for the environmental impacts of the decision, Trump said he'd like to try to renegotiate some sort of continued relationship with the other nations involved in the agreement but "if we can't, that's fine".
"The damage caused by this decision is undeniable and that's why the first piece of legislation I wrote as a member of Congress called for our country to keep the pledges we made in this agreement, the promises we made to the world, and to ourselves".
Trump's decision showed that the administration cares about "our economy and jobs only", Hescox added.More news: In Saudi Arabia, Trump admits India is 'victim of terrorism'
Vice President Mike Pence said that Trump "has demonstrated his commitment... to put American workers, American consumers, American energy, and the American people first". Time reports that at the North Atlantic Treaty Organisation summit last week, he and Donald Trump had a handshake showdown, with Macron reportedly gripping the US president's hand until both their knuckles turned white. "Against what we stand for, contrary to what the world expects".
The deal itself, which sets out the goal of limiting emissions of planet-warming greenhouse gas emissions, is binding under global law. "We will continue to lead the fight against climate change", Juncker said in a statement.
Trump formally announced his decision to leave the historic global agreement after months of teasing the action.
She said there was no turning back from the path that began with the 1997 Kyoto protocol and - until Thursday night - had the consent of nearly every country in the world. In 2008, MA lawmakers passed a law requiring the state to reduce its carbon emissions by at least 80 percent below 1990 levels by 2050.More news: Welcome Russia's unconditional support on 'cross border terrorism': PM Modi
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