In 1990, during the presidency of the first George Bush, Congress passed the Global Change Research Act. Along with reorganizing government-funded climate research, the Act stipulates that, every four years, the federal agencies involved provide an update on the state of climate science.
It has been four years, and the next report's draft has been completed and has undergone scientific vetting.
The draft paints a grim picture of how the US is already dealing with a variety of issues related to climate change and how much worse most of those issues will get during the coming decades. And the report places the blame squarely on humanity's greenhouse gas emissions.