(AP) - After another U.N. climate conference gave only modest results, European Climate Commissioner Connie Hedegaard says the process needs to provide a "substantial answer" to global warming in two years to remain relevant.

Even if it succeeds, it's worth reconsidering whether the international confabs need to be held every year, and whether the scope of each session should be narrower, Hedegaard told The Associated Press on Sunday.

"Maybe it would be time now to think if there should be themes for the conferences so that not each conference is about everything," she said in a telephone interview.

In two decades, the U.N. talks have failed to provide a cure to the world's fever. Heat-trapping carbon emissions that scientists say are warming the planet are growing each year as most countries still depend on coal and oil to fuel their economies.

Besides those emissions, the U.N. talks deal with a range of complex issues, including monitoring and verification of climate actions, accounting rules, and helping developing countries cope with sea level rise, desertification and other climate impacts as they transition to clean energy.

The two-week session that ended Saturday in Warsaw nearly collapsed in overtime before agreements were watered down to a point where no country was promising anything concrete.