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Imagine Hyde Park in Sydney without its tree cover … the impact on this space and the many people who spend time in it would be profound. EA Given/Shutterstock

Increasing tree cover may be like a ‘superfood’ for community mental health

Cities around Australia have plans to increase their green space, but new research shows not all green spaces are equal. Good tree cover is better than grassed areas for residents' mental health.
Australian cities could lose some of their most common trees to climate change. Jamen Percy/Shutterstock

Our cities need more trees, but some commonly planted ones won’t survive climate change

Thirty tree species make up more than half of Australia's urban forests. Some won't survive climate change, so cities must plant a more diverse mix of the right species to preserve their tree cover.
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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