John Yan is doing well, and he is giving back by donating part of his salary to charity. The 27-year-old software engineer began donating in 2019, pledging 1% that year, before raising it to 3% in 2020, and then to 15% in 2021. He donates via a global scheme called Giving What We Can (GWWC), which encourages people to give 10% of their earnings to charity - one they choose, or one from a list that GWWC recommends. GWWC was founded in 2009 by two university students, now academics, who focus on "effective altruism". GWWC says 6,439 people around the world have signed up, with more than $244m (£183m) donated so far. It saw its fastest-ever growth in 2020.

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