Want a green internship, a green classroom or even a green city? Then act! A new crop of contests are letting environmentalists dream big green dreams — and giving a select few the opportunity to turn them into reality. Don’t let your doubt of success hold you back — applying is free for all of these contests, so don’t let opportunities don’t pass you by this year!

>> Students: Apply for Sierra Club’s The Best Internship on Earth. Now in its second year, Sierra Club’s internship contest seeks one lucky green student who’d like to enjoy a summer of travel and exploration — “hiking, rafting, and camping with the Sierra Club’s Youth Programs” — and vlog about the fun times.

In exchange for this fun “work,” the intern will get not only a stipend, but also $2,000 gift certificate to The North Face. Just submit a video showing Sierra Club what makes you the best pick for The Best Internship on Earth by March 16. Good luck!

>> Teachers: Get nominated as an Earth Month Hero. If you’re an eco-minded teacher in Los Angeles or Orange County, California, get some attention — and some money — for your green work! The nonprofit Wyland Foundation’s giving out more than $20,000 in prizes to “teachers who are inspiring their students to become better stewards of our planet.”

If you’re selected as one of the winners, you’ll get a $500 for your classroom — and be eligible to win the $5,000 grand prize along with prizes for your classrooms. Just get someone to nominate you by filling out a simple form by March 9.

>> Cities: Win a green marketing campaign. Have a plan to make your city more eco-friendly — and need some marketing help to bring that plan to life? A creative services firm headquartered in Phoenix is holding The Paint Your City Green Contest — and any U.S. city with a population of 45,000 to 500,000 can enter.

According to the contest’s website, “the campaign includes brochures, avenue banners, billboards, signage, and more valued at approximately $85,000″ — plus 50 gallons of Greener by Design paint from Dunn Edwards. Get your application in by filling out a surprisingly simple Web form with a dozen or so questions about your plan to green the city by Feb. 28.