Eurozone leaders have agreed on a comprehensive package designed to shore up banks, including making more than a 1,000bn euros ($1,366bn) available for interbank loans.
Mr Sarkozy said the EU wanted to launch "a new Bretton Woods summit" in November, referring to the 1944 meeting which led to the creation of the International Monetary Fund and other global institutions.
Other members of the group of eight industrialised nations (G8) have also signed up to the summit.
With a recession looming, some Eastern and central European countries are unhappy at the burden of cuts they will be expected to bear under the existing climate agreement.
They argue that a legacy of inefficient and coal-dependent industry, dating from the Soviet era, has made it much harder for them to achieve big emissions cuts.
Mr Sarkozy said he was pushing hard for an agreement on climate change and energy action by the end of the year.
"On the climate package, we have obtained unanimity... It is now for President Barroso and myself to find solutions for those countries which have expressed concerns," Mr Sarkozy said.
In other summit business, talks on a new EU-Russia partnership treaty were postponed, amid continuing concern about Russia's military presence in Georgia. There were divisions about when to resume them.
A decision to revive the failed Lisbon treaty, meant to give the EU more stable institutions in difficult times, is expected to be put on the back-burner until December.
Irish Prime Minister Brian Cowen promised to come up with an action plan by then on the best way to move ahead next year.
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