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Trees cut heat on city’s streets – City of Perth

“Experts have long known that the canopy provided by trees can affect temperatures.

The thermal imaging results, which are in the City of Perth’s draft urban forest plan, put a figure on the reality of that relationship.”

Fantastic to see the City of Perth  communicating  the linkage between tree canopy and heat.

The work provided in this article,  is the result of a precision urban forest monitoring project carried out by ArborCarbon and partners in early 2015.

It is essential that we use this type of high-resolution imagery for  precision baseline measurement and monitoring  to achieve realistic targets and sustainable urban forest management.

See article in today’s West Australian by Kate Emery here.

Victoria Avenue is much cooler than treeless streets Picture – Bill Hatto -The West Australian

Urban greening becoming a hot issue for WA

“Heatwave-related deaths in Perth are expected to more than double from 137 in 2011 to 378 by 2050 as the state faces increased warming due to climate change.

This prediction from the State of Australian Cities 2013 places Perth fourth in Australia for the number of annual heat-related deaths behind Brisbane, Melbourne and Adelaide.”

To put this in perspective WA’s Road Toll  was 161 for the whole state in 2015, with 74 deaths in the Perth metropolitan area.  See below the Annual Fatalities from traffic accidents in WA.

Road deaths by year

 

Greens launch Urban Forest Plan

 

On Monday night the WA Greens launched their new Urban Forest Plan for Perth,  at the WA State Library.

The event was a huge success, filling the 207 seat lecture theater to capacity and forcing some late comers to have to watch from the entrance.

Urban trees and green spaces look destine to be an important election issue this year, as communities across Perth are becoming increasingly concerned about increasing tree removal and bushland clearing, which is causing rising urban temperatures, the loss of biodiversity and amenity.

The Greens plan is exactly what Perth needs with our scorching summer temperatures. However, as Senator Scott Ludlam pointed out, achieving it will require work in other areas, such as improving public transport and cycling infrastructure to reduce the need for more and more roads.

It will also require  Local Governments to take measures to educate residents about the many important benefits that trees and natural areas provide and take measures to protect them.  Many will also need to embrace new technologies that are available to better monitor and analyse their urban canopies and improve the ways in which the manage them.

The State Government (WAPC) determines our planning laws and must give approval for much of what Local Governments do, so their role will as be crucial, as their current planning laws enable developers to build and pave over virtually every thing.

Change must come from the people themselves, as most trees and vegetation are being lost from privately owned land, due to urban infill and redevelopment.  Councils can only do so much, street trees and parks will not be enough.  We wont have a leafy city if we don’t stop removing existing trees and start leaving room to plant new ones.  In the past people retained a lot more trees and built around them, these days blocks are completely cleared and leveled.  It seems builders have forgotten how to build on the natural contours of the land?

Greens urban forest plan

Image: Battery Park, New York - Greens Urban Forest Plan

Image: Battery Park, New York – Greens Urban Forest Plan

 

 

 

 

 

Today Tonight (Perth) – Trees and development

 

ArborCarbon’s  Dr Paul Barber, was asked to comment on last night’s Today Tonight;

“Trees keep us cooler and are good for our health, so why are we chopping so many down?”

 

Perth’s leafy western suburbs are rapidly losing their tree canopy cover.

Nedlands losing it’s tree cover

ArborCarbon scientists undertook a study over 2 years based on aerial surveys using multi-spectral, high resolution imaging. The results were startling and concerning.

The majority of councils within the ‘leafy western suburbs’ have experienced a loss in canopy cover over the  two-year period.

The study showed that the hottest areas in the western suburbs had little vegetation and an excess of sand. Examples include Campbell Barracks, Mt Claremont, the area south of UWA, immediately west of Shenton bushland, the QEII medical centre and Sir Charles Gardner Hospital – and around Subiaco Square.

Some of the coolest areas are, of course, where there is a body of water like Lakes Claremont and Monger. Other cool areas include suburbs within Subiaco, the Wembley golf complex, and Perry Lakes Reserve.

I am passionate about the need to maintain and foster tree growth in urban areas. Replacement with young trees is not the solution as they could take 50 years to mature before the same shade and cooling benefits are realised.

We need to embrace trees and the benefits they provide, rather than seeing them as a nuisance or being scared that a tree will fail simply because it is a big tree.

The tree loss shown in this study is a major concern as we know that canopy cover is directly linked to the Urban Heat Island Effect. We are compounding the problem by not conserving our canopy and this impacts the health of people in our communities.

To read more please read the full story on WAtoday.

WAtoday