greta thunberg

"We know it's happening. We need change. We demand better," an 11-year-old girl said at a march in Thailand. Protesters are calling for net-zero carbon emissions and other changes.

From St. Paul, Minn., to Stockholm, Sweden, students skipped school Friday to demand decisive action on climate change. Demonstrations were called in more than 100 countries and territories.

16-year-old Greta Thunberg has been the inspiration for many of the protests. She has staged weekly protests on the steps of the Swedish Parliament and spoke this week at Davos.