BBC: Environmental campaigners walked out en-masse from climate talks here in Warsaw saying they felt no progress was possible.
Several hundred people left the national stadium venue amid anger over the slow pace of negotiations.
But UK climate secretary Ed Davey told reporters he still expected "modest progress" to be made.
And other negotiators indicated that a deal was possible on some of the most contentious issues.
The talks began almost two weeks ago in the wake of Typhoon Haiyan with...