How buildings in Johannesburg could benefit from green roofs

Green roofs, like this one in Sao Paulo, Brazil, have many benefits. Leonardo Ikeda/Shutterstock</span>There are about 500,000 square metres of green space in Chicago in the United States. Many of these are visible, not on the ground, but on building roofs across the city. Green roofs can be seen in a number of other cities around the world.
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