Indeed. For most it's nor ideology, but a genuine difference of opinion regarding how bad CO2 climate change will be in the next 100 years and how easy it will be to mitigate.

That said, there's a fairly large degrowth faction who are very underrepresented in debate/discussion forums like this who would genuinely want to reduce energy consumption and fossil fuel consumption even if they didn't cause climate change. I encounter them a fair bit in the real world.