But demand for hydrogen-powered vehicles remains low, and claims the gas is a net-zero technology are still unproven.

Campaigners likened the fossil fuel company’s patronage of climate events to letting an “arsonist sponsor a fire safety conference”.

Ministers met with Onward, accused of being “a fossil fuel dinosaur in new clothing”, more than any other think tank last year.

BP sees sponsored content as a crucial tool to reach “Washington, DC, elites,” according to subpoenaed memos.

After donating £50,000 to a Conservative faction in December, the Legatum Institute has now hired Lynton Crosby’s influential CT Group.

Despite calls to stop representing polluters, Edelman will continue to promote one of the world’s biggest producers of oil and gas.

A 2023 DeSmog investigation uncovered a “backroom deal” between Portland city officials and Zenith Energy. New documents show the state environmental regulator also met with the company.

Resource Works founder Stewart Muir pitched the idea at an industry conference in Vancouver.

Government summits with oil and gas executives far outnumbered its engagement with green groups.

Internal documents expose how oil and gas majors were given the chance to influence a report by the Policy Exchange think tank.