justin rowlatt, bbc news. for more on this, i'm joined by geoffrey supran. he's a professor of environmental science and policy at the university of miami, and an expert on the history of climate change disinformation and propaganda by fossil fuel interests. good to have you on today's programme. what do you make of anthony gutierrez —— antonio guterres�*s cole to try and stop the sector who are very powerful from advertising? thanks for having me. i think this is a landmark moment. the climate crisis, as your correspondent referred to, is no longer fundamentally scientific or technological.