Protesters are delivering a letter to the prime minister, saying they'll pause their actions until October the 25th, ahead of the Cop26 climate conference in Glasgow.
It says the "collapse of the climate is happening around us" and claims we face the "breakdown of law and order in a matter of years".
The group have blocked junctions of the M25 including Heathrow and Leatherhead, as well as Wandsworth Bridge, causing outrage to drivers.