Thousands of Southern California hospitality workers have ratified a new contract with 34 hotels after repeated strikes since the summer.

Greta Thunberg has been detained by British police alongside other climate activists who gathered outside a central London hotel to disrupt a major oil and gas industry conference.

Workers are picketing major Southern California hotels after walking off the job during the holiday weekend to demand better pay and benefits.

Thousands of hotel workers in Southern California walked off the job Sunday, demanding higher pay and better benefits in what the union is calling the largest strike in its history.