Squire
Active member
"Tree cover in Australia’s capital cities declined in every capital city except Hobart between 2013 and 2020, according to the report."
Increased urban vegetation won't happen for many reasons including water costs and garden waste removal costs.
The problem is that the owners of trees and other vegetation including lawns bear the costs of water and waste removal while the whole community benefits. Homeowners bear the costs of broken reticulation and damaged grassed verges when the councils do nothing about people who park and drive on verges.
Also, tall trees close to houses affect solar power systems. Their roots also occasionally cause problems with underground services.
That's why concrete and brick paving are replacing lawns and shade sails are replacing trees. That is why homeowners are allowing grass verges to degenerate into bare dirt and weeds.
I personally have a 360 degree planted garden around the house with more than 10 trees towering above the house. Yes its expensive to get the trees trimmed and especially to remove dead trees which happens from time to time. Yes, the garden does produce a microclimate and the estate I live in is well treed which does cause a widespread microclimate in the estate which is cooler than surrounding areas. I water the garden for 30+ minutes every morning.
https://theurbandeveloper.com/articles/urban-heatwaves-hit-suburbs
Increased urban vegetation won't happen for many reasons including water costs and garden waste removal costs.
The problem is that the owners of trees and other vegetation including lawns bear the costs of water and waste removal while the whole community benefits. Homeowners bear the costs of broken reticulation and damaged grassed verges when the councils do nothing about people who park and drive on verges.
Also, tall trees close to houses affect solar power systems. Their roots also occasionally cause problems with underground services.
That's why concrete and brick paving are replacing lawns and shade sails are replacing trees. That is why homeowners are allowing grass verges to degenerate into bare dirt and weeds.
I personally have a 360 degree planted garden around the house with more than 10 trees towering above the house. Yes its expensive to get the trees trimmed and especially to remove dead trees which happens from time to time. Yes, the garden does produce a microclimate and the estate I live in is well treed which does cause a widespread microclimate in the estate which is cooler than surrounding areas. I water the garden for 30+ minutes every morning.
https://theurbandeveloper.com/articles/urban-heatwaves-hit-suburbs
Trees Can Curb Urban Heatwaves
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The heat is on Melbourne, Brisbane and Sydney to increase urban vegetation and prevent scorching summer temperatures.
Regions with higher levels of vegetation are cooler regardless of population density, according to Monash University’s temperature check report.
Researchers compared Sydney’s Liverpool city with a population density of 774 people per sq km to the Northern Beaches with 1076 people per sq km.
They found the Northern Beaches with 63 per cent green cover only experienced a 1.1C heat change across the region.
Meanwhile Liverpool had 4.1C more heat in some areas as a result of a so-called urban heat island and only 33 per cent vegetation cover.
Urban Heat Island effect
Urban Heat Island effect: Source: Temperature Check - adapted from City of Parramatta material
^Source: Temperature Check - adapted from City of Parramatta material
Tree cover in Australia’s capital cities declined in every capital city except Hobart between 2013 and 2020, according to the report.
The report, released by the Australian Conservation Foundation, found temperatures could regularly reach 40-50C in cities in a phenomenon known as the Urban Heat Island effect in the next 30 years.
However, these projections are not that far away —in Penrith last year temperatures soared to between 45.6C and 48.9C in suburban versus vegetated areas.
Capital city green infrastructure
Capital city green infrastructure ^Source: Temperature Check via Hurley, J, et al. 2020
^Source: Temperature Check via Hurley, J, et al. 2020
Monash University report co-author Lucy Richardson said tree cover reduced the economic burden of heat-related impacts and the heat differences across cities.
“Heatwaves kill more Australians than any other natural disaster and these will get more severe as our climate continues to change,” Richardson said.
“Protecting and expanding urban vegetation is good for human health and wellbeing, reduces heat-related deaths, creates jobs and helps combat climate change by absorbing more carbon dioxide from the air.
“Our research shows increasing urban vegetation will become essential for our three largest cities—Sydney, Melbourne and Brisbane—to reduce serious heatwave impacts by 2060-2080.
“Natural infrastructure takes time to establish to its maximum effectiveness, so acting early is critical for meeting future needs.”