Those willing to follow the evidence in climate science wherever it leads. Namely, that global warming is real, human-caused and disrupting. That said, there's nothing inherently wrong with all technology and modern life.
Those who think concerns are overplayed and probably motivated by a left-wing agenda. Also those who think the Earth's climate system isn't changing at all (it might even be cooling down). Weather has always been messy and unpredictable anyway.
Global warming is a threat so big that violent acts and sabotage is necessary to stop it