Climate Change - The Hardest Challenge We've Ever Faced

You say that climate change is the hardest challenge we as a species has ever faced. Why is it so difficult? Well the energy and intensification of the economy that starts with the industrial revolution is it's a phenomenally positive development. We're asking the world to make this shift away from those in the remaining 27 years between now and 2050. You know, appropriately we've taken that as this ambitious goal because to the degree we fail to do that, the weather is going to get worse and worse.