The sheer magnitude and complexity of the issue make such compensation unlikely. The notion of seeking justice for a global catastrophe that affects almost every country — with enormous implications for economic development — is not only immensely complicated but also politically daunting.

It assumes the culpability of the world’s most developed nations, including the United States and those in Europe, and implies a moral responsibility to bear the costs, even as those same nations seek to draft a new treaty over the next two years that would for the first time compel reductions by rapidly emerging nations like China and India. As a group, developing countries will within a decade have accounted for more than half of all historical emissions, making them responsible for a large share of the continuing impact humanity will make, if not the impact already made.

Assigning liability for specific events — like Typhoon Haiyan, which struck the Philippines with winds of at least 140 miles an hour, making it one of the strongest storms on record — is nearly impossible. It can take scientists years just to determine whether global warming contributed to the severity of a particular weather event, if it can be determined at all.

Many negotiators here have pressed to create a new mechanism that effectively accepts the idea that the results of climate change are irreversible and that the countries that are hit hardest first must be compensated.

“We’ve reached a stage where we cannot adapt anymore,” said Ronald Jumeau, the United Nations representative for the Seychelles, who is his country’s chief negotiator here. He noted the devastating effects not only of extreme storm events, but also of creeping desertification, salinization and erosion that could result in financial losses and even territorial issues that the modern world has never had to face.

“This is new,” he said. “This is like, ‘The Martians are landing!’ What do you do?”

John Kioli, the chairman of the Kenya Climate Change Working Group, a consortium of nongovernmental organizations, called climate change his country’s “biggest enemy.” Kenya, which straddles the Equator, faces some of the biggest challenges from rising temperatures. Arable land is disappearing and diseases like malaria are appearing in highland areas where they had never been seen before.