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A daily round on living greener, and streak missions that count what your habits save.
Which kitchen habit wastes the most food in rich countries?
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One ranked attempt per day. Practice as much as you like.
What players on GreenChallenge.com have actually done. Every check-in and approved proof adds one line. The math behind each number is shown on the card, with its source. Full ledger →
Local missions are things you can do where you live — in Columbus that means your own street, shoreline or school. Global missions add up across every arena on the network.
Seven days with no disposable cups, bottles, bags or cutlery. Carry your own. Check in each night.
+0.1 kg waste per check-inA typical day of single-use items (one coffee cup, one bottle, two bags, one set of cutlery) weighs about 0.1 kg (Ocean Conservancy item weights).
Counted with SavingTheWorld.org
Rinse and sort every recyclable item for a month, and learn what your local program actually accepts. Check in daily.
+0.5 kg waste per check-inThe average US household discards about 2 kg of recyclable material a day and captures only a third of it (EPA Facts & Figures). Sorting everything diverts ~0.5 kg more per day.
Keep food scraps out of the bin for three weeks: a backyard pile, a worm bin, or your city's green cart. Check in daily.
+0.25 kg waste per check-inAmericans waste about 0.27 kg of food per person per day (EPA). Composting it keeps that out of landfill, where it would release methane.
Keep every shower under five minutes for two weeks. A timer or a two-song playlist does the trick. Check in daily.
+25 L water per check-inCutting a shower by three minutes saves about 28 litres with a standard 9.5 L/min showerhead (EPA WaterSense). We count 25.
Set heating one degree lower or cooling one degree higher than usual for ten days. Check in daily.
+0.3 kg CO₂e per check-inOne degree of thermostat change saves roughly 1 to 3% of heating or cooling energy, about 1 kWh-equivalent a day for a typical home, or ~0.3 kg CO₂e (IEA, US DOE).
Run a 20-minute session for a classroom, team or family on one topic from this arena. Post a photo link or a one-paragraph recap with how many people joined.
+1 hours when approvedCounted as one hour given. Reach is noted in your proof but not multiplied.
Counted with Contrib.com
SavingTheWorld.org is the impact home of the eCorp network: 2% of every venture is set aside for the planet and for keeping AI safe. Planet-track missions roll up there.
Community trackContrib.comContrib.com is where contributors earn a stake in the ventures they help. Community-track missions count hours and local actions.
Free alerts for every Florida county when sewage is spilled, algae toxins are detected, lake discharges surge or the Weather Service issues a warning. The local-mission radar for this arena.
Alerts, every marketAlertStream.comEcoBoard’s alert engine expanding beyond Florida: weather warnings, water quality and other concerning events for any place you follow, so a mission can start the day something changes near you.
Daily briefingClimateNews.comThe climate newsroom of the network: what moved today, with sources, so the daily round has something real to ask about.
Check-ins are self-reported and shown as logged. Proof missions are reviewed by a person before they count as verified. Each per-action figure is a conservative public estimate (EPA, IEA, UN Environment or peer-reviewed sources named on the card), rounded down. These numbers are for keeping score and staying honest, not for carbon accounting or offsets. If you think a figure is wrong, say so on the contact form and we will fix it in public.
Live counts from GreenChallenge.com. All arena stats →
Earned on any arena, shown on your profile everywhere.
Add your email to keep your level, streak and badges if you switch devices, and carry them to every iChallenge arena. One email when you save; no spam.
Fund a prize on GreenChallenge.com and your brand sits on the challenge card, the leaderboard and every finisher's share. Prizes only appear once they're funded, so players can trust what they see.
Post a link or note as proof. Approved entries finish the challenge and earn the Finisher badge.
Sponsors can fund cleanup and conservation prizes. Each funded prize is listed on its challenge card.
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
100 points per correct answer, up to 50 more for answering quickly, a combo multiplier for answers in a row, and 150 bonus points for a perfect round.
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.
