It is almost impossible to know the truth of things, especially technical, legal, scientific matters, because there are "experts" on both sides of every issue and they present all kinds of "evidence" for their side.
The link below is to a Just Facts page on Global Warming. In it they mention Bill Nye. The upshot of the article there is no "settled science" on this matter and, in fact, it is very much in dispute. One thing I did not know is that the so-called data used to compare historical temperatures to modern temperatures is not from actual temperature. Before 1850 or so there were no such temperature records so, they use what is called "proxy" data....tree rings, sediments etc. Very few of these are available and they are not real accurate.
Many serious scientists doubt that the warming we do actually see is faster than it should be or is primarily caused by mankind. Bill Nye is not one of these climate scientists. He is NOT a climate scientist and has no education or training at all in the field. He is a mechanical engineer and, according to the article addicted to false, (fake) data and junk science. He is a fool!