Now David Siegel has changed his opinion on climate change. He created a website with independent climate research: https://www.cuttingthroughthenoise.net
It looks pretty nice and it's well written and I won't delve deep into the flaws, I'm sure others will.
However one big thing that climate change skeptics/deniers keep missing or handwaving about renewables is that they've never listened to Wayne Gretzky. None of them are skating to where the puck will be. Living in the past is worse for everyone.
I don't have to follow or agree with someone overall to also think that "even a broken clock is right twice a day" :-)