Academic Freedom versus Science

Tennessee's Republican legislature has enacted a new law allowing teachers to question the science of Evolution. The legislation protects teachers from helping students "review in an objective manner the scientific strengths and scientific weaknesses of existing scientific theories" including… "evolution, the chemical origins of life, global warming and human cloning." It will become law unless Governor Bill Haslam vetoes it today, which he's not likely to do. Is it back to the Scopes trial of 1925? Why is challenging Global Warming also protected?