2020 is a key year for action on climate and other sustainability goals. Photo by hpgruesen/Wikimedia Commons

It seems like a lifetime ago when at the Rio Earth Summit in 1992, I watched more than 100 heads of state and government queue to sign the original documents of the Framework Convention on Climate Change, the Biodiversity Convention and Agenda 21. Negotiations had been tough, and some leaders were more enthusiastic than others. But to everybody in the room, it was clear that this was a moment of clear moral purpose, a coming together of the global community to address critical global threats that no individual nation could tackle on its own.

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