Earth Day, April 22, 2015

President Barack Obama is celebrating Earth Day with a visit to the Everglades to talk about how global warming threatens the U.S. economy. In this photo, military personnel salute as Air Force One departs with the president aboard from Andrews Air Force Base, Maryland on its way to the Everglades, April 22, 2015.

President Barack Obama walks the Anhinga Trail at Everglades National Park, Florida, April 22, 2015.

A group of volunteers gather on a square decorated with a giant world map during Earth Day celebrations in Lisbon, Portugal, April 22, 2015.

A student collects waste as she joins other environmental activists in a coastal cleanup along the shores of Freedom Island to mark World Earth Day, in Las Pinas, south of Manila, Philippines, April 22, 2015.

Guests gather around electric vehicles as NRG eVgo and Simon celebrate Earth Day with the opening of three new eVgo fast-charging Freedom Station sites across the greater Atlanta area, in Kennesaw, Ga., April 21, 2015.

In conjunction with the World Earth Day on April 22, about a dozen protestors from the Malaysia Socialist Party gathered outside the Malaysia Nuclear Agency to protest the development plans of a nuclear reactor in Malaysia.