Just 25 cities globally are responsible for 52 percent of urban greenhouse gas emissions, according to a new study that highlights the role that cities must play in reaching the goals of the 2015 Paris Climate Agreement.
Great cities set the tone for modern living and a new campaign for Car Free Megacities is aiming to improve the music of our urban streets as well as clear their air.
Climate change means many health risks. Any one of them raises the danger. What happens when extreme heat meets bad air? South Asia's humid megacities face special jeopardy.
The global wildlife trade, agricultural intensification, deforestation and urbanization are bringing people closer to animals, giving their viruses more of what they need to infect us: opportunity.
