The U.K.’s Thursday referendum on European Union membership means that the United Nation’s global warming plans need to be rewritten, according to the executive secretary of the Paris global warming deal.

The referendum, often called Brexit, significantly changes the agreement, which assumed Britain would remain part of the EU.

“From the point of view of the Paris Agreement, the UK is part of the EU and has put in its effort as part of the EU so anything that would change that would require a recalibration,” Christiana Figueres, one of the architects of the Paris global warming deal, said the day before the Brexit vote. “In principle, it is actually, historically, we say, as humankind, we are moving towards larger and larger tents of collaboration […] rather than in the opposite way.”

Progressive outlets like The Guardian are already claiming that Brexit will reduce environmental protections and create more carbon dioxide (CO2) emissions.

The U.N.’s Paris global warming agreement will cost a minimum $12.1 trillion over the next 25 years, according to calculations performed by environmental activists. However, these estimates are likely low, as they exclude energy efficiency measures which will bring the total to $16.5 trillion, according to projections from the International Energy Agency.

That’s almost as much money as the U.S. federal government spent on defense in 2015, according to 2015 spending numbers from the bipartisan Committee For Responsible Federal Budget. The required annual spending is almost 3.7 times more than the $131.57 billion China spent on its military in 2014.

The deal, which was heavily encouraged by the Obama administration, encourages nearly 200 countries to reduce carbon dioxide emissions, slowing global warming. Secretary of State John Kerry however admitted that reducing carbon dioxide emissions in the U.S. and the developed world will not help the environment or even slow down global warming.

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