Will the inter-governmental climate conference in Paris in December be a decisive turn in the world’s efforts to curb risks of catastrophic climate change? At present this is highly unlikely but not inconceivable. It will certainly not be enough of itself. But a combination of new technological opportunities and new approaches to a deal opens up fresh opportunities. The conference might mark the end of the beginning, the point at which serious efforts to change our trajectory begin.

In his book Why Are We Waiting? , Nicholas Stern, author of the Stern Review on the economics of climate change, lays out the challenges and opportunities with clarity and passion.

He advances three propositions. First, humanity’s overriding goals for the 21st century should be the elimination of mass poverty and risk of catastrophic climate change. Second, these goals are complementary. Third, the case for early action is overwhelming, both because greenhouse gases stay in the atmosphere for centuries and be-cause investments in energy, transport and urban infrastructure will lock in the carbon intensity of our economies.