We are no doubt living in challenging times, with cities so often the focal point of social tensions that are felt well beyond their limits. But cities also offer us so many solutions. For the good of their entire countries today and tomorrow, we need national leaders to seize the new urban opportunity, writes Nick Stern.

The climate crisis does not begin or stop with Africa, but African countries can play a leadership role in seizing the opportunities of a better future. The world's larger economies have a responsibility to unlock this future, for themselves and for others, writes Ngozi Okonjo-Iweala.

How can Africa realize economic prosperity without contributing further to climate change? The solution lies in a kind of Green New Deal – a comprehensive strategy for achieving sustainable growth, including through coordinated, large-scale investment in renewable-energy deployment, writes Carlos Lopes.

Invest in cleaning up the hard-to-abate sectors such as cement and steel so that new infrastructure is green, writes Naina Lal Kidwai.

European voters have delivered a green mandate. It’s up to our governments to use it, writes Caio Koch-Weser.

Three policy priorities can help the region lead the transition to a clean economy, writes Ngozi Okonjo-Iweala.

The government of Indonesia is blazing a trail for other emerging economies with its recognition of the adverse health, financial and environmental impact of high carbon emissions, and its new plan charting a course towards sustainability, says Nicholas Stern.

As the two largest emerging economies, China and India are already at the forefront of economic growth and development. Now, they are becoming global leaders by taking ambitious steps to combat climate change, writes Naina Lal Kidwai.

Green industrialisation is a major opportunity for African countries to ‘leapfrog’ the fossil-fuel based growth strategies of developed countries, instead charting sustainable growth paths to a healthier, more prosperous future, writes Carlos Lopes.

Now that the Paris rulebook is decided, leaders around the world should already be thinking ahead about how they can step up their country's ambition, writes Naina Lal Kidwai.