Earth Day events are getting underway in 183 countries, leading up to the 30th anniversary of Earth Day this Saturday, April 22. This year’s Earth Day campaign is focusing on clean energy and global warming, says Denis Hayes, chair of Earth Day Network and one of the organizers of the first Earth Day in 1970. In the U.S., the flagship event will be a massive fair and rally in front of the Capitol in Washington, D.C. In South Africa, Earth Day organizers are staging a mock evacuation from an area around a nuclear plant. In Indonesia, a million cars will be kept off streets in a national car-less day inaugurated by the president. In London, an eco-festival focused on renewable energy is expected to draw 40,000 people. Major events are also planned for New Delhi, Beijing, Warsaw, and thousands of other cities around the world.