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All Challenges

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Become a Fan of Hopenhagen

Join the community of Hopenhagen fans and get updates from the movement.

4675 Participants
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Sign the Climate Petition

Sign the UN Climate Change Petition at hopenhagen.org. Make your voice heard.

4362 Participants
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Invite 10 Friends

Visit the My Friends tab above to invite friends to join Hopenhagen.

4057 Participants
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Embed a Hopenhagen Badge

Find embeddable buttons for Hopenhagen here.

3358 Participants
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Turn Off Unused Lights

If there's no one in the room, then there's really no reason to light it, right?

2895 Participants
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Send a Hopenhagen Email

Spread hope to everyone in your address book using our email tool.

2744 Participants
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Refill a Reusable Water Bottle

Producing and shipping plastic bottles releases tons of carbon into the atmosphere.

2520 Participants
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Walk, Bike, or Ride

Walking, biking and taking public transportation are the greenest ways to travel.

2301 Participants
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Unplug Electronics

Appliances draw power even when they're powered off or not in use.

2283 Participants
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Write My Local Representative

Tell your local leaders you support a successful climate agreement.

2233 Participants
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Buy Organic and Local Foods

Local foods don't have to travel as far, thus saving carbon.

2095 Participants
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install CFLs in your home

CFLs last 10 times as long as incandescent bulbs.

2077 Participants
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Wash Clothes in Cold Water

Using cold water instead of hot or warm uses less energy.

2039 Participants
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Use a Laptop

Energy-efficient laptops use 70% less electricity than desktop computers.

1686 Participants
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buy recyclable materials

Look for products packaged in or made from recycled materials.

1567 Participants
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Carpool to Work/School

Less cars on the road means less carbon in the air.

1413 Participants
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Close curtains during the day

Don't depend only on AC and still keep your house cool.

1339 Participants
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Turn Down the Water Heater

120° F is usually hot enough.

1238 Participants
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Bring in my own Coffee Mug

Styrofoam and paper cups create needless waste. Use a mug from home.

1201 Participants
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Take Canvas Totes Shopping

A reusable bag is easier on the planet than plastic ones.

1160 Participants