Over the past two decades, the world has witnessed a remarkable period of economic and human development: more than 2 billion people have gained access to improved drinking water; life expectancy has increased by approximately five years; more children are going to school, with 90 percent enrolled in primary education; and per capita income levels have doubled across developing countries.

China has experienced an even more profound transformation during this period. The country has sustained an annual GDP growth of around 10 percent. Five hundred million people have been lifted out of extreme poverty. People's lives have visibly improved and there are more opportunities for them.

Yet, many challenges remain. With the world's expanding population, rapid economic growth and booming middle class, the pressure on natural resources is mounting. The truth is the world is on an unsustainable path.