Leaders of some of the world's biggest cities vowed on Thursday to make all buildings carbon neutral by 2050, ensuring they make no contribution to climate change.

From London to Tokyo, 19 mayors said they would put in place regulations requiring all new buildings to be carbon neutral by 2030 and all existing ones to reach the same goal by 2050.

"Climate change poses an existential threat to New York City, and making our buildings more sustainable and efficient is a key part of the solution," said Mayor of New York Bill de Blasio in a statement.

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