If you believe that climate change poses an existential risk then it isn't just a view that you may hold. The actions of your company along this front would represent a threat to your health and safety. You would be suicidal in a sense to not try to use your leverage (striking) to change the policy of the company. Maybe they can replace one person but replacing 900 people would be a huge disadvantage.
Belief that climate change is inevitable is not just a view, no, but believing that my company can do anything within it's power to have positive enough effect on climate change that is anywhere near noticeable on anyone that doesn't know what my company is doing, is. If I'm looking to blame someone for the effects of global warming on my health, my employer is last on my list.
