Gas is flared at Robinson Deep, Johannesburg's biggest landfill, and at Marie Louise, another of its five sites. But generators will be installed this year at the former to turn the methane into power. When all its landfills are all online, it will produce enough power to supply 12 500 middle-income households.
Is the universe expanding? What is dark energy? What's the deal with gravity? And the biggest question of all; are we alone? The Square Kilometre Array, which will aim to answer these questions and more, is slowly taking shape in a remote corner of South Africa's starry-skied Karoo.
Breakthrough experimental work by University of KwaZulu-Natal scientist Sandile Ngcobo as part of his PhD research has led to the development of a world-first digital laser set to open up revolutionary new technologies for medicine, communications, manufacturing, product development and more.
Two days, six questions, tough challenges. The International Mathematical Olympiad, regarded as the most difficult but prestigious of the Olympiads, was hosted in South Africa for the first time, and the country did well against the world's best, earning a medal and several honourable mentions.
Some 600 students from schools across the world are in Cape Town for two days of rigorous tests during the 55th International Mathematics Olympiad, the biggest in its history and the first to be hosted in Africa.
Climate change need not spell disaster for Africa, a panel of experts agrees. But to mitigate its effects, strong enforcement of laws needs to be put in place, and urban planning needs to be modernised and include urban green planning. Trees must be planted and open spaces preserved.