rooftop gardens

    By Meelan Thondoo, University of Cambridge   Cities cover just 3% of the planet. But they emit 78% of all global greenhouse gas emissions, absorb 80% of final global energy (what consumers use) and consume 60% of clean drinking water. African megacities like Lagos, Nigeria (with 21 million residents) and Cairo, Egypt (with 10 million residents) are experiencing significant temperature increases due to the urban heat island effect […]