The Nobel Peace Prize will be announced just three weeks before world leaders gather for a climate summit that scientists say could determine the future of the planet, one reason why prize watchers say this could be the year of Greta Thunberg. While the winner often seems a total surprise, those who follow it closely say the best way to guess is to look at the global issues most likely to be on the minds of the five committee members who choose. With the COP26 climate summit set for the start of November, that issue could be global warming. That could point to Thunberg, the Swedish climate activist, who at 18 would be the second youngest winner in history by a few months, after Pakistan's Malala Yousafzai. Another big issue the committee may want to address is democracy and free speech. That could mean an award for a press freedom group or a prominent political dissident, such as exiled Belarus opposition leader Sviatlana Tsikhanouskaya or jailed Russian activist Alexei Navalny could get the coveted prize. The medicine prize opens the season on Monday, followed by the awards for physics on Tuesday, chemistry on Wednesday, literature on Thursday and peace on Friday. The economics prize wraps up the Nobel season on October 11.