China, India, South Africa and Brazil say a climate agreement expected to take effect in 2020 won’t be a “new regime,” potentially setting up a confrontation with the United States, which is seeking to eliminate a firewall in negotiations between developed and developing nations. The four countries are reining in expectations for the Durban Platform, according to a statement released following a meeting of the so-called Basic bloc in Beijing. The statement may set up a conflict with the U.S. at two weeks of U.N. climate talks that start next week in Doha, Qatar. The U.S. has said any climate deals must treat nations equally, a shift from the Kyoto Protocol that has separate terms for developed and developing countries.