Denmark is highly urbanised. (Photo: Wikipedia) As climate change becomes one of the defining challenges of our time, some countries are showing the world how sustainability can move from policy to everyday life. From running on hydropower to protecting forests and investing in clean transport, these nations are setting examples in environmental responsibility. Here are seven of the greenest countries in the world and what makes them stand out. 1. Denmark Denmark is often seen as a global leader in sustainability. The country has invested heavily in wind energy and aims to become carbon neutral in the coming decades. Copenhagen is widely recognised for its cycling culture, with bicycles often preferred over cars for daily commuting. Denmark also focuses on energy-efficient buildings, waste-to-energy systems, and strong environmental laws. It consistently ranks high in climate action and green urban planning. 2. Sweden Sweden combines industrial development with environmental responsibility remarkably well.…