Earlier this month, scientists announced that humanity has kicked off the first major “tipping point” — in which an Earth system dramatically transforms, often permanently — as warm-water corals die en masse due to relentlessly rising temperatures. Think of such events like driving off a cliff: There’s no reversing back up to the edge, and the impact will be terrible.

For all the attention these disastrous milestones get from scientists and the media — and rightfully so — less discussed is the fact that they also work the other direction. Positive tipping points can unfold on a wide range of scales, from a community garden helping a neighborhood eat healthier, all the way up to the global energy system switching from fossil fuels to renewables. An individual person can even reach one, l

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