According to a recent report by the Gauteng Department of Agriculture and Rural Development, Gauteng’s temperatures are increasing at double the rate of global temperatures. This is due to two factors, global temperature trends and the heat island effect experienced in an incredibly urbanised province.



The Heat Island Effect
That cities have warmer surface temperatures than surrounding rural areas is attributed to the “Heat Island Effect”. Through urbanisation the landscape is transformed from grassland to urban structures. Urban surfaces such as bricks, tar and concrete tend to absorb more heat. This results in higher surface and air temperatures in urban areas.

How trees help
There are many solutions to help us reduce the effects of urbanisation and climate change. Surfaces such as roofs, walls and paving can be changed into greener surfaces, which absorb less heat. The simplest solution however, is planting trees.

Trees disrupt the warming effects in a number of different ways;
Trees block the sun from warming up city surfaces. Some studies show that trees can reduce surface temperatures by between 11˚C and 25˚C and air temperatures by about 5.5˚C.
As the sun hits the trees, the trees transpire, emitting water droplets that reduce the air temperature

Trees also provide many other benefits to the urban environment, as detailed in the next page.

As such, planting trees in tree-less urban environments is an increasingly important endeavour, not only for the offset of carbon emissions, but also to help the populace adapt and cope with increasing temperatures in the next century.

The combination of indigenous and fruit tree planting through the Trees for All and Trees for Homes programmes, solves this issue, as well as the issue of food security facing the country.

Further Reading:

For more information about Trees and the Heat Island Effect you can look at the following:

1. United States Environmental Protection Agency’s Heat Islands Resource https://www.epa.gov/heat-islands and chapter on planting vegetation as a strategy

2. Livesley, S., McPherson E.G., Calfapietra, C. 2016. The Urban Forest and Ecosystem Services: Impacts on Urban Water, Heat, and Pollution Cycles at the Tree, Street, and City Scale. Journal of Environmental Quality. 45:119–124

3. McPherson, E.G., J. R. Simpson, P. J. Peper, S. E. Maco, and Q. Xiao. 2005. Municipal forest benefits and costs in five US cities (PDF) (6 pp, 267K). Journal of Forestry 103(8):411–416.

4. ‘The essential role of trees – adapting to climate change be managing high temperatures and reducing pressure on drainage systems’, Gill S in proceedings Trees and Urban Climate Adaption: a sociable agenda for living cities, 19 November 2009.

, ,
Previous Post
#PlantYourLegacy with FTFA this Arbor Month
Next Post
Nourishing The Nation with Tiger Brands

Related Posts

Set It Right

Arbor Month 2017 – Food & Trees for Africa (FTFA) launches new programme with innovative social tech Fundraising for communities and the environment using integrated Social Media Platform On 01 September 2017, as part of their Arbor Month campaign, Food…

Planting a Legacy this Arbor Month

14,137 Trees and Counting – Planting a Legacy this Arbor Month – 2017 – Food & Trees for Africa JOHANNESBURG – September 01 2017 – The 1st of September, Arbor Day, will see Food & Trees for Africa (FTFA) and…

KMSA and FTFA, Greening Rustenburg with 1,072 Trees

Rustenburg – May 2018 – The 2ndof May was an exciting day for the 1,349 students of Kloofview Primary School, Rustenburg. The learners gathered for a special tree planting assembly – about trees and how to plant them. Konica Minolta…

International Day of The Forests 2017 with FTFA

Food & Trees for Africa is celebrating the International Day of the Forests this month by planting at least 2980 trees nationwide. FTFA is focussing on urban forests, which play a critical role in improving the urban environment and cooling…

Keeping an Eye on Community Development with Tiger Brands

In 2017, Tiger Brands reached out to Food & Trees for Africa. After community development meetings held in March, vegetable gardens and tree planting initiatives were planned for the year ahead. These initiatives are designed to address food security, carbon sequestration and community…

Food Forests – FTFA’s New Programme

On the 9th of March 2018, Food & Trees for Africa, together with the Department of Agriculture, Forestry and Fisheries (DAFF) launched their first food forest, in Evaton, near Johannesburg, to celebrate International Day of the Forests 2018. We will be…