04/25/2015 - Cities around the globe need to re-invent themselves if they want to be a safe home for generations to come. Nobel Laureates call upon cities to tackle the dual challenge of population growth and climate change and seize the opportunity to lead the transition to sustainability. National and internationally agreed greenhouse-gas reduction targets need to guide and support local action. The distinguished scientists signed a memorandum this week in Hong Kong at the end of the three-day Nobel Laureates Symposium on Global Sustainability, convened for the first time in Asia. The Symposium was co-hosted by the Potsdam Institute for Climate Impact Research and the Asia Society Hong Kong Center.