DOHA, Qatar – During a year with a monster storm and scorching heat waves, Americans have experienced the kind of freakish weather that many scientists say will occur more often on a warming planet.

And as a re-elected president talks about global warming again, climate activists are cautiously optimistic that the U.S. will be more than a disinterested bystander when U.N. climate talks resume Monday with a two-week conference in Qatar.

“I think there will be expectations from countries to hear a new voice from the United States,” said Jennifer Morgan, director of the climate and energy program at the World Resources Institute in Washington.