Figures linked to the Global Warming Policy Foundation have handed huge sums to the Tories.

A host of parliamentarians were previously employed by agencies with fossil fuel clients.

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

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

The world’s most valuable company has a long record of greenwashing, lobbying and polluting.

Fossil fuel giants are largely left to submit their own extraction and emissions data, a freedom of information request shows.