Earlier this summer, Democratic presidential nominee Joe Biden unveiled a climate plan that calls for spending $2 trillion during just his first term to boost clean energy, electric vehicles, energy-efficient buildings, and other green efforts. Most notably, perhaps, the plan aims to eliminate carbon emissions from the electricity sector by 2035.

Some environmental groups, however, are worried that the campaign’s ambitious goals could be undermined by influence from the fossil fuel industry — and now they’re calling on Biden to commit to an administration completely free of industry representation. In a public letter released Tuesday, more than 140 environmental organizations asked that Biden “ban all fossil fuel executives, lobbyists, and representatives from any advisory or official position” in his “campaign, transition team, cabinet, and administration.”