Here is the remarkable scientific discovery: For the first time in human history, science is now making predictions of how our actions will affect the world fifty and a hundred years from now. These changes are due to the increase in carbon dioxide put into the atmosphere since the beginning of the industrial revolution.

The Earth has warmed up by roughly 0.8 degrees Celsius since the beginning of the industrial revolution. There is already approximately a one degree rise built into the system, even if we stop all greenhouse gas emissions today. Why? It will take decades to warm up the deep oceans before the temperature reaches a new equilibrium.