WASHINGTON (AP) — Train singer Pat Monahan says fixing the environment means “getting our hands dirty because it’s not going to be an easy thing.” Monahan was one of the performers at Saturday’s Global Citizen 2015 Earth Day rally on the National Mall in Washington, along with Usher, Mary J. Blige, Gwen Stefani, Common and Fall Out Boy. Usher took the stage on crutches after fracturing his foot but got big cheers for dancing anyway. Will.i.am, one of the rally’s hosts, says he hopes people walk away from the rally and talk about solutions, go online for answers and hold leaders accountable for the things they’re pledging.