The group Extinction Rebellion said the protests Monday were taking place in 60 cities worldwide in countries including Turkey, Canada, South Africa and Mexico.
Police arrested at least 13 people at the Saturday rally.
A citywide strike and demonstrations in seven districts in Hong Kong have been called for Monday afternoon.
The spontaneous demonstration was one of several heartfelt expressions of support and condolences for the victim of the El Paso mass shooting.
Police say some "milkshakes" hurled in skirmishes included quick-drying cement.
Trevor Noah's team put together a startling side-by-side comparison.
Over 500 street demonstrations around the country marked International Women's Day.
The digital assistant had its say.