He didn't doubt climate change. He propagandized against it because it was in his financial interest to lie.
Climate
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
Live your life in such a way that everyone doesn't celebrate your passing the way the Ewoks cheered the destruction of the Death Star.
As usual, the media sanewashes these people by describing them as "doubting" and being "skeptical" about climate change. He didn't do either. He knew it was happening, and decided to hasten the mass extinction of life on Earth and the collapse of human civilization, while lying about it and persecuting anyone who spoke the truth, in order to make himself richer than anyone needs to be. And the article talks about his "fairness" and "firmness" to disguise a reality of greed, lies, and abusive management culture, all in the service of deeply destructive goals.
He did all this knowing full well he'd never be around to experience the horrors he has wrought on the planet and society
Its disgusting
Imagine being so evil. He prolly didn't think much of it.
I'm very happy this shit bag is dead, but it sucks ass that he got to live so long and died peacefully. Hopefully more oil CEOs, and just CEOs in general, meet their demises sooner.
Kissinger shit right here
Sometimes I wish I wasn’t atheist, then I could at least believe this guy was burning in hell right now.
You could adopt that belief in the hope that it's true. Sort of like Pascal's wager but for punishing your enemies. An asshole's wager, if you will
He knew exactly what was going on and made the decision to hire the tobacco-cancer denial machine to confuse the public and prevent a timely shift away from fossil fuels
Rest in Piss
May this man rot in hell, and may people like him who are still around live in agony and loneliness.