Articles on Trees

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How many lakes are in Alaska? Thermokarst lakes on Alaska’s North Slope are self-similar and fractal. Painting by Cherissa Dukelow

Mathematics of scale: Big, small and everything in between

What do earthquakes, wealthy Italian families and your circulatory system have in common? Scientists use fractals, self-similarity and power laws to translate from local to global scales.
The short answer is that leaves fall off trees when they aren’t doing their job any more. Emily Nunell/The Conversation CC-NY-BD

Curious Kids: why do leaves fall off trees?

Leaves fall off trees when they aren’t doing their job any more. If there isn’t enough water, the leaf can be damaged and stop working.
Just off Washington Square in New York City. Frej Berg/Flickr

The value of trees: 4 essential reads

Trees clean urban air, store carbon, slow floodwaters and can be used to design safer streets. Scholars are starting to calculate what these services are worth – a fitting topic for Arbor Day.
In 1919, 1,376 new Norway Maples were planted along streets in Brooklyn. Department of Parks of the Borough of Brooklyn, City of New York

Not so long ago, cities were starved for trees

In 1910, along one 45-block stretch of New York City's Fifth Avenue, there were only 13 trees.

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