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THP_music t1_iv0x1bh wrote

Reply to comment by SEND_INVENTION_IDEAS in Researchers fed microalgae on leftover coffee grounds to produce high-quality biodiesel | It could decrease reliance on palm oil to produce biofuel. by chrisdh79

I'm seeing an estimate of 18 - 21 billion tons (or tonnes depending on which side of the pond you are) a year globally

a source: https://www.bio-bean.com/news-post/zero-waste-week-no-such-thing-as-waste-coffee/#:~:text=Coffee%20doesn't%20have%20to%20be%20wasteful&text=And%20with%20an%20estimated%20average,of%20wet%2C%20waste%20coffee%20grounds.

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SEND_INVENTION_IDEAS t1_iv12iha wrote

So each person on Earth produces 3 tonnes of coffee waste each year? 8 kg a day? At ~20 g a cup that's 400 cups of coffee a day per person.

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