We do not know how much our climate could or will change in the future. We do not know how fast change will occur or even how some of our actions could impact it.
There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.
The world must come together to confront climate change. There is little scientific dispute that if we do nothing, we will face more drought, famine and mass displacement that will fuel more conflict for decades.