Nature and EnvironmentGreening citiesTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoNature and EnvironmentMaria Lesser12/14/2018December 14, 2018Cities occupy only two percent of the world's landmass, but their carbon footprint is huge: they account for more than 70 percent of global CO2 emissions. How can we improve the air in cities?https://p.dw.com/p/3A469Advertisement