The Gulf Stream does not appear to be slowing down, say US scientists who have used satellites to monitor tell-tale changes in the height of the sea.

Confirming work by other scientists using different methodologies, they found dramatic short-term variability but no longer-term trend.

A slow-down - dramatised in the movie The Day After Tomorrow - is projected by some models of climate change.

The research is published in the journal Geophysical Research Letters.

Political and business leaders gather this week in an attempt to revive the world's faltering challenge to global warming. But they face a battle to lift the cloud of scepticism that has descended over climate science and chart a new way forward.

As an array of expertise, it is formidable: but then so is the task they have been set by the UN secretary general, Ban Ki-moon. In effect, the world's top financiers have been told to work out how to raise at least $100bn a year for the rest of this decade, cash that will be used to help the world's poorest countries adapt to climate change.

"The prices we pay for our goods do not reflect one key cost: the damage that their production does to the planet's climate system," said Bob Ward, of the Grantham Research Institute on Climate Change at the LSE. "We need to find ways to extract payment from those who cause that damage and then use that money to fund developing nations so that they can protect themselves from the worst effects of global warming."

And to raise those funds the Advisory Group on Climate Change Financing has made clear that it will consider everything – from placing levies on international aviation and shipping, to enlarging carbon markets, introducing financial transaction taxes and using the International Monetary Fund's special reserve currency. You name it and it will be run up the flagpole – for success in establishing a developing world finance plan is now considered crucial to the success of next December's UN climate change meeting in Mexico. "Finance is a prerequisite for a climate agreement," said Rajendra Pachauri, chair of the UN's Intergovernmental Panel on Climage Change, on Friday. "Developing countries are very sensitive about this. Talks will collapse without strong and secure financing in place."