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“We know the seasons are changing and oftentimes farmers plant their crops at the wrong time, because they don’t have the information they need,” Ms. Dent said. “In the past, the seasons were more predictable. But these days it’s not the same time each year.”

The State Department did not respond to a request for comment.

However, the Obama administration’s top climate official told a London think tank last month that an increase in public funding from developed countries is unlikely.

“Now the hard reality: no step change in overall levels of public funding from developed countries is likely to come anytime soon,” Todd Stern, U.S. special envoy for climate change said at Chatham House in London on Oct. 22.

“The fiscal reality of the United States and other developed countries is not going to allow it. This is not just a matter of the recent financial crisis; it is structural, based on the huge obligations we face from aging populations and other pressing needs for infrastructure, education, health care and the like,” he said. “We must and will strive to keep increasing our climate finance, but it is important that all of us see the world as it is.”

Ashish Kumar Sen contributed to this report.