The U.N. climate talks in Doha were extended into Saturday because delegates remain divided over how to stop climate change and how to pay for it, and how to deal with their differences.

The talks were due to end Friday, but negotiators struggled to agree even on more modest issues.

Developing countries want to extend the Kyoto Protocol, which obliges developed nations to cut greenhouse gas emissions. The protocol is scheduled to expire on December 31.

Poor countries also want firm commitments from rich nations to boost aid for them to $100 billion annually by 2020 – a general pledge that was made three years ago. But rich nations are not willing to commit to specific targets now, citing world financial turmoil and pressure on their budgets.

A spate of scientific reports released during the two-week meeting provided compelling new evidence that the Earth's climate is warming. They also predicted dire consequences – from rising sea levels to more severe droughts, floods and storms – unless action is taken to reduce climate-changing carbon dioxide and other greenhouse gas emissions.