Made a resolution for the new year yet? If you’re looking for last-minute green goals to challenge yourself with in 2010, check out these green group challenges you can join. Fellow resolved environmentalists can help keep you on your green path and toward your eco-goals:

>> Current Green’s ONE GREEN THING New Year’s challenge. If you already have a general green goal — but are afraid it’s not specific or task-oriented enough — try Current Green’s program. This flexible challenge basically lets you set whatever goal you want — but also offers a more specific 5-step programs to turn your nebulous ideas into real eco-action.

>> The Compact. Started a few years ago by a group of Northern Californians who pledged not to buy anything new for a year, this eco-lifestyle challenge and its thrifty members are still going strong. Recently, longtime Compact member Katy Wolk-Stanley wrote about her un-consumer lifestyle at Fake Plastic Fish. Read about her experience to see if you’re up for the challenge!

>> The No Impact Experiment. Started by Colin “No Impact Man” Beavan’s eco-nonprofit No Impact Project, this experiment invites all to sign up for a week-long eco challenge, with the goal to “help you live a happier life that will result in a happier planet.” If long-term commitments aren’t your strong suit, starting with this week-long dealio might help you kick off 2010 with an eco-success under your belt. An added bonus: The challenge has iPhone apps!

>> The 2010 Happiness Challenge. Like the happiness idea behind The No Impact Challenge — but need a longer-lasting program? Gretchen Rubin, author of The Happiness Project, is running a year-long happiness challenge — complete with a happiness project toolbox — that’ll tackle a new area of life each month. This challenge isn’t eco-specific, but is customizable — so remember to inject your own green motivations into the project.

Tempted to tackle all 4 projects at once? Don’t let your leftover eggnog-fueled enthusiasm get the better of you. Make too many green New Year’s resolutions and you’ll overwhelm yourself into eating processed fast food while driving a Hummer!

Okay — Maybe MNN readers are unlikely to ever go the Hummer route, but do make resolutions in moderation. In the Wall Street Journal How We Decide author Jonah Lehrer explains the neuroscience behind why too many resolutions lead to unfulfilled resolutions: “Willpower, like a bicep, can only exert itself so long before it gives out; it’s an extremely limited mental resource.”

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