Hippos drink as much as 250 litres of water in any given 24 hour period.

Around three quarters of the increase in CO2 levels from human activity over the last 20 years is from the burning of fossil fuels. The rest is made up largely of land use changes such as deforestation.

There are 327,000,000 cell phones in use in the United States, more than one per every human being in the country.

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