“This is not the end, but it is a new beginning,” said Christiana Figueres, the Costa Rican diplomat who serves as executive secretary of the United Nations Framework Convention on Climate Change. “It is not what is ultimately required, but it is the essential foundation on which to build greater, collective ambition.”

The agreement sets up a new fund to help poor countries adapt to climate changes, creates new mechanisms for transfer of clean energy technology, provides compensation for the preservation of tropical forests and strengthens the emissions reductions pledges that came out of the last United Nations climate change meeting in Copenhagen last year.

The conference approved the package over the objections of Bolivia, which condemned the pact as too weak. Bolivia’s chief climate negotiator, Pablo Solón, said that the emissions reductions laid out in the plan would allow global temperatures to rise as much as 4 degrees Celsius over the next half century, twice the stated goal of the agreement and a level that would doom millions in the poorest and most vulnerable nations.

But his protests did not block acceptance of the package. Delegates from island states and the least-developed countries warmly welcomed the pact because it would start the flow of billions of dollars to assist them to adopt cleaner energy systems and adapt to inevitable changes in the climate, like sea rise and drought.