UN Secretary General Ban Ki-moon on Tuesday called the world's efforts to contain climate change "insufficient" and urged countries meeting in Cancun, Mexico, to come up with a "breakthrough."

"I'm deeply concerned that our efforts so far have been insufficient, that despite the evidence and many years of negotiation we are still not rising to the challenge," Ban told the UN-led talks of more than 190 nations.

"Business as usual cannot be tolerated," he said. "Cancun must represent a breakthrough."

Delegates say the two-week talks in the beach resort have been making steady progress, but largely on small issues, with the hardest decisions — including on nations' cuts in carbon emissions — put off until later.

"Nature will not wait while we negotiate," Ban said, warning that scientists predict that the effects of climate change may soon be irreversible.

"The world, particularly the poor and vulnerable, cannot afford the luxury of waiting for the perfect agreement," he said.

"Action now and movement on as many issues as possible must be our way here in Cancun. Every country can and must do more."

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