Starting around 1980, when atmospheric CO2 hit 340 ppm for the first time in a million years, annual global temperatures began rising more steadily, with smaller deviations. Since 2000, every year has been trending warmer than the last, and, since 2010, these annual increases have been steadily greater. By almost any measure, anyone born after 1990 is finding themselves in a new geological era, navigating a world fundamentally different from the one Baby Boomers and Gen Xers inherited. The chances of anyone alive today experiencing a year as relatively cool as 1996 are effectively nil.
