OSLO, Norway — About 42 million people were forced to flee their homes because of natural disasters around the world in 2010, more than double the number during the previous year, experts said Monday.

One reason for the increase in the figure could be climate change, and the international community should be doing more to contain it, the experts said.

The Internal Displacement Monitoring Centre said the increase from 17 million displaced people in 2009 was mainly due to the impact of “mega-disasters” such as the massive floods in China and Pakistan and the earthquakes in Chile and Haiti.

It said more than 90 percent of the disaster displacements were caused by weather-related hazards such as floods and storms that were probably impacted by global warming, but it couldn’t say to what extent.

“The intensity and frequency of extreme weather events is increasing, and this trend is only set to continue. With all probability, the number of those affected and displaced will rise as human-induced climate change comes into full force,” said Elisabeth Rasmusson, the secretary general of the Norwegian Refugee Council.

The monitoring center and refugee council presented the report at an international conference about climate change and displacement in Oslo.

The number of people displaced last year is roughly the size of Argentina’s entire population, and the onslaught of natural disasters so far this year also has been grim, with Japan’s earthquake and tsunami and tornadoes and floods in the U.S.