These "reports" have been coming out for decades.
There is no consensus on man-made/caused global warming...or as they have changed the name now...man-made climate change. They are changing the name because reality these last few years has not been fitting the predictions.
Single volcanic eruptions in the past have produced as much, or more in some cases, hydrocarbons than all of man-added since the industrial revolution.
In the late 1970s and early 1980s the predictions were that the ice caps would be entirely melted by the year 2000.
Now, there is climate change...but it is part of a natural cycle...which is not altogether predictable because there are many natural variables, including the sun itself.
So, what may happen or not 900 years from now is something we are very unlikely to impact appreciably ourselves shorty of all out nuclear war.
Having said that, I...and most Americans I know...are conservationists and good stewards of the environment. You do not destroy what is providing your energy...your food...your water...etc. You should always leave a place as good if not better than how you found it. There are many laws in the US that reflect this...and in fact, though there is certainly over regulation, the US has the finest laws on earth.
Of course we should explore and develop all energy sources. Geo, hydro, solar, hydrogen, nuclear, and continue to improve upon and develop oil, natural gas and coal. The US should be doing all of that, and doing it responsibly.