By congressional mandate, scientists from multiple federal agencies prepare a National Climate Assessment every four years.  A final draft report completed this year concludes that Americans are feeling the effects of climate change right now.  The report received little attention until it was just published in the New York Times.  Scientists leaked the draft out of concern that the Trump administration might try to suppress it.

Here is a quote from the New York Times article reporting on the climate assessment report:

The report concludes that even if humans immediately stopped emitting greenhouse gases into the atmosphere, the world would still feel at least an additional 0.50 degrees Fahrenheit (0.30 degrees Celsius) of warming over this century compared with today. The projected actual rise, scientists say, will be as much as 2 degrees Celsius.