DOHA, Qatar – As nearly 200 countries meet in oil-and-gas-rich Qatar for annual talks starting Monday on slowing global warming, one of the main challenges will be raising climate aid for poor countries at a time when budgets are strained by financial turmoil.

Rich countries have delivered nearly $30 billion in grants and loans promised in 2009, but those commitments expire this year. And a Green Climate Fund designed to channel up to $100 billion annually to poor countries has yet to begin operating.

Borrowing a buzzword from the U.S. budget debate, Tim Gore of the British charity Oxfam said developing countries, including island nations for whom rising sea levels pose a threat to their existence, stand before a "climate fiscal cliff."