A coalition formed by 19 mayors of major U.S. cities including New York, Los Angeles, San Francisco and Washington D.C. has proposed a plan to ensure that all new buildings be net-zero by 2030. The mayors are part of a group of cities, known as the C40, dedicated to climate action. The cities’ initiative is part of a larger plan to make both old and new buildings net-zero by 2050.

Related: This revolutionary sustainable community in Atlanta is still thriving 15 years after its founding

Net-zero buildings are extremely efficient and powered exclusively by renewable energy sources, often found on-site. Making new buildings net-zero would therefore have a massive impact on cities’ greenhouse gas emissions. Buildings account for over half of greenhouse gas emissions within large cities; for some older cities, such as London and Paris, buildings can account for almost 70 percent. The C40 mayors are committed to lowering these figures.

“Ensuring Portland’s old and new buildings achieve net zero carbon use is an essential challenge I am ready to take on,” announced Mayor Ted Wheeler of Portland, Oregon, one of the cities that signed the pledge. “Portland has been a longtime global leader in environmental initiatives and I look forward to continuing to advocate and fight for ambitious environmental strategies.”

Related: SOM’s net-zero Paris skyscraper will be one of the most sustainable buildings in Europe

The cities will join forces with the World Green Building Council (WorldGBC), the organization that set the 2030 benchmark, to achieve their emissions goals. The mayors will meet again as part of the Global Climate Action Summit in San Francisco.

California has taken a strong stand for climate action, with the goal of making all new buildings net-zero by 2020, a decade earlier than the date in the C40 pledge. Many of the cities in the C40 group have pledged to create fossil-fuel-free streets and use zero-emission buses. This latest pledge to make new buildings net-zero is yet another step in the right direction.

+ WorldGBC

Via Curbed