One hundred members of the public will be chosen to steer policies to tackle climate change in South Yorkshire.
The region’s mayor Oliver Coppard pledged to abide by decisions made by the citizens’ assembly in what he said was “a new way of doing politics”.
Letters will be sent at random to 30,000 people in Sheffield, Rotherham, Doncaster and Barnsley inviting them to take part.
Assembly members will be chosen by a lottery from those who respond.
They will spend 31 hours including nine in-person sessions focussing on the question: “The way our climate is changing will impact us all. How should we respond, to build a thriving and sustainable future for South Yorkshire?”