I Wei Huang / shutterstock
Garden leaves make good compost, but street leaves are too polluted.
It’s spring, but many street trees look stressed and sick. Heat and insect attack are arriving early. But our cities are also steadily losing canopy cover.
New research reveals how trees respond to extreme heat. Most trees lose more water than models predict. Some species cope better than others. Access to water will be critical for the hot summer ahead.
David M Watson
Mistletoes are ecological keystones that boost habitat value for wildlife, so we added them to established plane trees in the inner city.
The loss of so many trees in Sydney’s Castle Cove represents the theft of environmental benefits and services from future generations of Australians.
Tall. Straight. Abundant flowers. And a stunning trunk. What’s not to like about the spotted gum?
Housing intensification in Hamilton.
New Zealand’s urban green space has dwindled over the past six decades. The Commissioner for the Environment has issued a warning and a challenge – get greener before climate change gets meaner.
Photo: Jaana Dielenberg
Urban plantings are part of the solution to living in warmer cities, but most tree and shrub species in the world’s cities will struggle too. The impacts on liveability could be huge.
Seen from above, parts of our cities now have very little green space, and we’re losing the green corridors that enable wildlife to move between the remaining urban habitats.
A street fan provides relief on a hot summer day in New York City.
Stephen Chernin/Getty Images
Extreme heat waves are putting lives in danger, with some of the hottest urban neighborhoods 10 degrees hotter or more than their wealthier neighbors. Often, these are communities of color.
Interstate 980 cuts off West Oakland, Calif., at top, from other Oakland neighborhoods.
Jane Tyska/Digital First Media/East Bay Times via Getty Images
Two urban policy experts explain why taking down highways that have isolated low-income and minority neighborhoods for decades is an important part of the pending infrastructure bill.
Emerald ash borer larva cut these feeding galleries on the trunk of a dead ash tree in Michigan.
corfoto via Getty Images
Biological control strategies curb pests using other species that attack the invader. A biologist explains why it can take more than a decade to develop an effective biological control program.
As a tree scientist who works with urban trees, I can assure you some large, old trees are well worth leaving alone, even you find them annoying sometimes.
Somerset House is an example of enlightenment architecture, which precluded greenery which was believed to obscure its strong lines and go against ‘reason’.
All symmetrical lines and strict proportions, Enlightenment architecture believed that nature got in the way of reason.
Avenues of Honour were planted to remind us of the sacrifice and suffering of our servicemen and women. But as the years wore on, many declined or disappeared.
Tennessee warblers (
Leiothlypis peregrina) breed in northern Canada and spend winters in Central and South America.
Cities are danger zones for migrating birds, but there are ways to help feathered visitors pass through more safely
Drop of Light/Shutterstock
We must re-establish contact between our cities and the natural world.
Sleep might be a key factor in the link between greener neighbourhoods and better health. A new study shows living in an area with more tree canopy improves people’s odds of getting enough sleep.
Inner Melbourne alone has lost 2,000 street trees to major developments within a decade. Losing tree cover makes it even more difficult for our cities to cope with an increasingly tough climate.
Turning a street tree into timber is much more respectful and useful than mulching it all.
City trees are often short-lived and many others get cut down in their prime. Turning them into mulch both wastes timber and releases stored carbon. A wood rescue program creates a more fitting legacy.