Emma Thompson, Stephen Fry and Ben Okri have joined the former archbishop of Canterbury Rowan Williams and leading climate scientists to highlight what they describe as a “collective act of madness” that is driving “the destruction of life on Earth”.

A letter signed by more than 100 actors, authors, scientists and academics says the UK government is ignoring the scientific reality of the climate and ecological crisis, pushing ahead with new fossil fuel developments and criminalising peaceful protesters who raise the alarm.

“Rather than listening to reason or scientific fact, the UK government continues to hand out contracts for oil exploration in the name of false ‘energy security’ while steering the UK towards authoritarianism,” the letter states. “In Britain today, it is verging on illegal to urgently and effectively protest for the right of life to survive.”