Closing the gender gap is the right thing to do for women and the planet. It is also smart economics, write Ngozi Okonjo-Iweala and Isabella Lövin in Project Syndicate.

China and India, the world's two most populous nations, have much to learn from each other on urbanization, energy, and finance, writes Global Commissioner Naina Lal Kidwai.

China has come so far so fast that many people are unaware of how much progress it has made, from investing in renewable energy to tackling air pollution, says Lord Nicholas Stern in the Financial Times.

"Devising ways to scale financing for urban infrastructure, and to shift capital flows to make sure new projects are sustainable, is the next great challenge facing cities," write Michael Bloomberg and Patricia de Lille in CNN.