National Geographic: Two days before a United Nations summit on climate change, people are marching in cities around the world Sunday to urge their leaders to act boldly to reduce the greenhouse gas emissions that are driving the changes.
The "People's Climate March" comes just before more than 120 heads of state will gather in New York City for the summit, convened by UN Secretary General Ban Ki Moon. He wants to urge heads of state to act decisively by switching to cleaner sources of energy, preventing deforestation,...