Australia set the tone for the #globalclimatestrike, with massive crowds in major cities. 🌏 People all over the world are expected to walk out of their schools and workplaces on Friday to demand action to address the global climate crisis. It's the third in a worldwide series of rallies organized by school students and led by 16-year-old activist gretathunberg. In Melbourne, organizers said that more than 100,000 people joined a march. By going on strike on September 20 — and September 27 in a few countries — protesters hope to put pressure on politicians and policy makers to act on climate issues. (📸: Asanka Ratnayake / Getty Images)