DENVER, CO - APRIL 21: Sixth graders from Edgewater Elementary along with other students, from schools in the cities of Edgewater and Denver, clean up litter along Sheridan Boulevard, April 21, 2014. One hundred students worked to keep their community cle

A number of clean-up efforts are on tap for this weekend, as environmentalists mark Earth Day. 

More than 100 volunteer cleanup events have been scheduled along the 524-mile state canal system and its trails.

About 50 National Grid employees will help out at Schenectady's Central Park, and volunteers in Clifton Park will be working in the town's parks, and along the trails.

Photo: Getty Images