“Cities are the growth engines of the future, offering their populations greater opportunities for education, employment and prosperity. Yet, the negative effects of their growth can also result in traffic congestion, informal settlements, urban sprawl, environmental pollution, exploitation of resources and a significant contribution to climate change. Efficient and intelligent technology holds the answer to many of these urban challenges. That’s why Green Muslims has created ranking Cities category to provide cities and their related institutions with the best possible products, solutions and services. To make a major contribution to the debate about environmentally sustainable cities, we have commissioned the Green City Index. The research series now covers more than 60 cities worldwide. It has helped city stakeholders to better understand their specific challenges, provides them insights into effective policies and best practices and supports their decision making.