Washington Post: The environmental movement will mark Earth Day on Monday with events locally and elsewhere highlighting responses to climate change and other challenges facing the planet. In the District, Union Station will be a hub for observance of the 43rd anniversary of the first Earth Day in 1970. The Earth Day Network, a coordinating organization, said the station will host a farmers market, raffles, giveaways, an exhibit from NASA and a recycling drive. There will speeches at noon and live music at noon...