I have to agree, when money and interests like with the situation around climate change are involved its hard to do actual science, it just turns into a fucked up manipulation game.
Decades earlier, ExxonMobil spent millions to do its own science and came to the same conclusion. https://www.scientificamerican.com/article/exxon-knew-about-...
It's not hard to do the science. It's hard to be truthful about the results when they affect your bottom line.