A short, sourced quiz that meets you where you are — in any of 120 languages. Build a daily streak, master nine topics, and stop guessing what really matters.
For equal passenger-kilometres, which is typically the cleaner option?
Pew Research's 2024 global poll across 35 countries finds climate change at the top of long-term threats in most countries. Yale's Climate Change Communication programme finds that the majority of people across the world feel under-informed. Carbon Footprint Quiz exists to close that gap, five minutes at a time.
Sources: Pew Research Center (2024) · Yale Program on Climate Change Communication (2023)
We don't write opinion. Each quiz question maps to a primary or institutional source — usually one of the bodies below. The full citation list is exposed inside the app, on the answer screen of every question.
The IPCC's Sixth Assessment Report (2021–2023) is the most thorough scientific consensus on the state of the climate, impacts and mitigation. Carbon Footprint Quiz's questions on energy systems, transport, buildings, food and offsets all trace back to AR6 chapter findings.
IPCC (2023). AR6 Synthesis Report: Climate Change 2023.
NASA's earth-observation programme provides the long-running CO₂, temperature, sea-level and ice-sheet data series used in our questions on climate trends and feedbacks.
NASA Global Climate Change (2024). climate.nasa.gov.
The IEA's annual energy and emissions data underpin our quizzes on electricity grids, heat pumps, EVs, gas vs. renewables and the energy demand of data centres.
IEA (2024). World Energy Outlook 2024.
OWID's compilations of per-capita emissions, food carbon footprints, transport mode comparisons and energy mix are used for accuracy-checking every numeric figure shown to players.
Ritchie, H., Roser, M. & Rosado, P. (2024). "CO₂ and Greenhouse Gas Emissions". OurWorldInData.org.
Our food, diet and land-use questions cite the UN Food & Agriculture Organisation's analyses of livestock emissions, food loss and dietary footprints.
FAO (2023). "Pathways towards lower emissions: A global assessment of the greenhouse gas emissions and mitigation options from livestock".
Questions on scope 1, 2 and 3, supply-chain emissions and corporate climate disclosures map to the World Resources Institute / WBCSD's GHG Protocol standards.
WRI/WBCSD (2015). The Greenhouse Gas Protocol: Corporate Standard (revised edition).
Country-specific figures (e.g. household electricity carbon intensity) cross-reference the US EPA, European Environment Agency and DEFRA UK conversion factors.
US EPA (2024). "Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2022".
Our health-impacts and heat-mortality questions draw on the annual Lancet Countdown report on health and climate change.
Romanello, M. et al. (2023). "The 2023 report of the Lancet Countdown on health and climate change". The Lancet.
Browse the full citation list inside the app — every question carries 2–4 sourced links.
“I used to nod along in climate conversations. After two weeks of daily quizzes I'm actually the one explaining things — and I love it.”
“The eco-tips after each round changed how my family talks about dinner, travel and electricity. It's the most useful five minutes of my day.”
“Finally, climate content that doesn't shout at me. Carbon Footprint Quiz is the calmest, most rigorous climate app I've used.”
The full interface — onboarding, questions, settings, achievements — is translated. Pick yours in Settings; no system-language change required. Quiz content itself is delivered in English with native-language UI by default.
Free on iPhone and iPad. iOS 17 or later. New questions weekly.
Get it on the App StoreOr scan this QR code with your phone camera.