Prime Minister Shinzo Abe has pledged further assistance to help developing countries cope with climate change-related natural disasters, but he didn't disclose how much money Tokyo would be putting toward such efforts.

And his promise, delivered at the U.N. Climate Summit in New York on Tuesday, was undercut by a failure to spell out exactly how Japan — one of the world's biggest greenhouse gas producers — will go about reducing its own emissions.

Addressing the summit, Abe said that "global warming is unequivocal" and called for action, promising that Japan would help train 14,000 people over the next three years in fields related to climate change, and that the country would increase technological innovation to help trim global emissions.