This live blog is now closed. You can read the full Guardian coverage of the climate talks in Brazil here
Hello comrades, this is Nina Lakhani in chilly New York City taking over the blog for the next few hours. Thanks very much to my colleague Matt Taylor in London Town who will be back in the hot seat on Friday morning.
Leading climate activists and influencers have signed a letter criticising PR firm Edelman over its role at the Cop30 summit in Brazil.