HAMPTON, Va. (AP) — Swedish teen climate activist Greta Thunberg will leave North America and begin her return trip across the Atlantic on Wednesday aboard a 48-foot (15-meter) catamaran sailboat whose passengers include an 11-month-old baby.

The boat leaves little to no carbon footprint, boasting solar panels and a hydro-generators for power. It also has a toilet, unlike the boat on which she sailed from the United Kingdom to New York in August . That one only had a bucket.

"There are countless people around the world who don't have access to a toilet," she said about the upgrade. "It's not t...