Oil (petro chem) target destructions is the most efficient way (by disrupting supply chains and economy, in my opinion) to pressure russia to stop their senseless aggression of Ukraine. The faster they do it, the better.
I'd argue that a burning oil refinery probably emits more harmful stuff into the environment than that same volume of oil used in a more controlled manner
Unfortunately humanity is destroying and will continue to destroy global ecosystems until most people are wiped out. Eco-terrorism will not change that (in my opinion).