World leaders have agreed to double the clean energy research funding they pledged in December as part of an international push to reduce carbon emissions, the White House announced on Thursday.

During the first meeting of the 21 countries involved in the Mission Innovation project this week, international members said they would increase the clean energy research and development funding the project is designed to facilitate.

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According to the White House, member countries will now spend $30 billion per year by 2021 on clean energy research.

“Today's actions show that the transition to clean energy is inevitable,” Dan Utech, President Obama’s energy and climate change adviser, told reporters Thursday. "Every sector and every level of government is involved, and the United States is all in.”

When the Mission Innovation project launched in November 2015 on the sidelines of the United Nations’s climate change conference, the U.S. committed to spend about $10 billion on low- and zero-carbon energy technologies by 2021.

The Obama administration said that number will not necessarily grow as part of the new funding promised on Thursday. Foreign leaders, including the European Union and other new members, have decided to increase their funding for the research.

The announcement comes as international climate leaders meet in San Francisco to discuss clean energy deployment around the world. Increased research spending was one of a host of clean energy commitments made this week, including promises from the private sector to speed up deployment of renewables and a new push for state and local governments around the world to focus on lowering emissions.

“Our collaborations … focus on doing that faster — more broadly — so as to make sure that all of the countries that are participating are able to implement what they pledged” in the Paris climate deal reached in December, said John Elkind, the assistant secretary of the Energy Department’s Office of International Affairs.