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Today Puzzle #642

Puzzle No. 642 – Monday 30 December 2019

With an average global temperature rise of 1.5℃, the UN expect the Arctic Ocean to be free of sea ice one summer per century. With 2℃ warming, they expect one summer free of sea ice per decade. Over the next century, how many more summers would the Arctic Ocean be free of ice, if average temperatures rose by 2 versus 1.5℃?

Today’s #PuzzleForToday has been set by Bobby Seagull is a school maths teacher and Cambridge University Doctorate student. He is also author of The Life-Changing Magic of Number, co-host of the Maths Appeal podcast and co-presenter of the BBC TV series Monkman & Seagull Genius Guide.

Click here for the answer

9 more ice free summers

2 degrees Celsius: free of sea ice once a decade, so 10 in 100 years.

1.5 degrees Celsius: free of sea ice once in a hundred years, so 1 in 100 years.

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