Breakthrough Energy, a group started by Microsoft co-founder Bill Gates that supports reducing emissions, has laid off multiple staffers and is cutting its policy arm, according to a person familiar with the matter.

Breakthrough Energy, an umbrella group for energy and environmental efforts funded by Mr. Gates, is resetting for the Trump era.

Breakthrough Energy, the climate group funded by Microsoft Corp. co-founder Bill Gates, has laid off dozens of employees in the US and Europe as it pulls back from public policy advocacy work that was a cornerstone of its mission.