National governments may be dithering, but the leaders of some of the world's megacities are proving that concrete action can be taken to prevent catastrophic climate change. The C40 Cities' latest Climate Action in Megacities report stacks up exactly what has been done.
Mayors and officials from major global cities gathered in Johannesburg this week for the fifth C40 Cities summit, to discuss ways urban leaders can tackle climate change – which former New York mayor Michael Bloomberg called "the greatest challenge of our time".
New building technology developed out of billions of research funding from South African petrochemicals giant Sasol is making a run-down old school in Soweto one of the most environment-friendly in the world.
Massive triple-glazed glass walls go up 11 storeys, an area equivalent to 50 tennis courts, flooding the inside with natural sunlight and giving workers stunning views over the green trees of Johannesburg. Welcome to Standard Bank's new five-star sustainable building.
Want to be in your photograph but don't want to ask a stranger to take your picture? TapShoot is the answer. The intriguing smartphone app for Windows phones grabbed its developer a top place in the Nokia Future/Capture contest.
The fifth C40 Cities Mayors Summit will take place in Johannesburg this month. It's a good time to look at the measures the city is taking to combat the effects of changing weather patterns. It is among the biggest emitters of greenhouse gases in South Africa, but it is working to rebalance this legacy.
It is billions of rand and years in the making, but once the Square Kilometre Array – most of which will be located in South Africa – is up and running, it will offer a clear hotline to the universe. The massive radio telescope installation will help scientists study the stars.