An Earth year

STOCKHOLM – On April 22, the world will mark the 45th anniversary of Earth Day, established in 1970 to draw attention to environmental challenges. Never have those challenges been greater or more urgent than they are today. The combination of climate change, erosion of biodiversity, and depletion of natural resources is propelling the planet toward a tipping point, beyond which objectives like sustainable development and poverty reduction will be more difficult than ever to achieve...