Over the course of 20 games this season, the Colorado Rockies will be enlisting fans and players toward making a positive impact on the environment through the "20 Games of Green" initiative.
The 20 games are split into three "Green Weeks," April 24-29, July 6-12 and September 1-7. Each "Green Week" will feature ticket packages, in-game incentives, fan contests, bike-to-the-game events and more.
They have a calendar of events, but here is a cool one:
"Wood for Wood" - For every Rockies home run hit during these 20 games, we will plant one tree in the Denver area.
Visit their page for more info and the calendar!