It’s as easy as tying your shoes.

Make a promise to the planet. Then show your support by lacing up with green.

Here are 10 athletes who did it. They’re green athlete liaisons, and they and others—representing every Middlebury sports team—will be working during Earth Day weekend, starting April 22, to promote a sustainable culture in athletics. Along with Nordic Skiing Head Coach Andrew Gardner, they’ll be collecting people’s pledges to the environment and handing out green laces to remind them of their promises. The idea is inspired by GreenLaces.org founder and professional soccer player Natalie Spilger, who says, “It’s time we stop only representing our sponsors and start representing our values.”

These athletes are doing it. Are You?

Carson Cornbrooks, Soccer: “I will only use biodegradable shower products”

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