280 ppm or less
Before the Industrial Revolution began in the mid-1700s, about how much CO2 was in the atmosphere?
Today's level of about 423 ppm is roughly 50% higher.
Source: NOAA Climate.gov (2025) climate.gov
Science · Guess the stat
How well do you know carbon?
Guess the real numbers behind carbon dioxide and emissions, see how everyone else guessed, and get the source.
Guess the statOne tap · see how everyone guessed
What was the global average concentration of carbon dioxide in the atmosphere in 2024?
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Today's round
- 4 stats to guess
- 1 opinion poll
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Guess, see the crowd, get the real number. One ranked attempt per day.
Carbon by the numbers
Real figures with their sources. All Carbon facts →
about 8,887 grams
How much CO2 is created by burning one gallon of gasoline?
The carbon in the fuel combines with oxygen from the air as it burns, so the CO2 produced weighs more than the gasoline itself.
Source: U.S. Environmental Protection Agency epa.gov
6,343 million metric tons CO2 equivalent
What were total U.S. greenhouse gas emissions in 2022, in CO2 equivalent?
This total excludes the land sector. Transportation is the largest direct source of U.S. emissions.
Source: U.S. Environmental Protection Agency, Sources of Greenhouse Gas Emissions (2022) epa.gov
What people think about carbon dioxide and carbon emissions
Vote to see the live results. All polls →
Which change would you most likely make to cut your carbon footprint?
Would you consider an electric vehicle for your next car?
Which form of carbon is most impressive?
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Questions
How does CarbonSurvey.com work?
Each question asks you to guess a real number about carbon dioxide and carbon emissions. After you answer you see how everyone else guessed, then the real figure and where it comes from.
How is the daily round scored?
Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.
Where do the numbers come from?
Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.
Is it free?
Yes. Playing, streaks, badges and leaderboards are free, and your votes stay anonymous.