Warning signals loud and clear

IMAGE: DANIEL KINGSTON AFTER ED HAWKINS The climate stripes (shown here for Dunedin) are a compelling way to look at how temperature has changed over the past 100 years or so. They show how average annual temperature has changed, with darker blue colours indicating cooler conditions, and red for warmer years. The story is similar around the world: decades of variation around a relatively stable average, followed by irregular — but sustained — warming.

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