Juan Mancias is the president of the Carrizo Comecrudo tribe of Texas. He says he is "extremely disappointed by what is happening" at Unesco.

"The urgency is there, plastic, it is no longer possible, in the delta of the Rio Grande," he says. "Some governments, including my own, do not want to hear anything," he adds. "I am extremely disappointed," he tells CNN. "It's a pitiful mine"