"The fellows ... don’t expect every lawmaker to fall in line. They understand that politicians will ignore the best evidence if jobs are at stake or voters are opposed to a policy.

“It’s a learning process and managing your expectations and understanding the hard reality of how policy works … Evidence is just part of the process. "

This is a big part of the problem with government, and with society.  If an issue has been well studied, and a scientific consensus reached, government should have the integrity as well as communication skills to present, defend, and act on that evidence.  Brad Wall is arguing that there isn't enough study of the impact of climate change mitigation efforts--questionable.  However, never has there been any evidence offered for the strategies he is embracing.  Governments need to respect data, truth, science, and fact, else we're acting on wilful ignorance and populism.  This is how our world has been brought to the cliff edge.