How does a quaint university town in southwestern Germany confront climate change? What does it say about urban green credentials when it comes to applying strict, but user-friendly environmental standards? In this special program of The Hub "Green Talks with Mayors," Wang Guan talks to Eckart Würzner, LordMayor of Heidelberg, to discuss two decades of green initiatives, from energy-efficient schemes to a more liveable, greener environment. Würzner tells Wang Guan about the "Heidelberg standard" of sustainable development and delves into the city's "passive housing projects" aimed at building one of the world's largest carbon-neutral districts. He believes it's essential to bring the private sector on board through incentives and that such an approach can serve as a template and be replicated worldwide.