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.

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

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.