it is prima facie wrong to perform an act which has an expected amount of harm greater than another easily available alternative

there is a duty not to be complicit in a process that cannot be justified to others

even if I lower my use of fossil fuels, energy companies have an incentive to use up that nonrenewable energy source and will encourage others to do so. My actions will therefore make no difference to the causation of climate change because even if I abstain from an action that emits greenhouse gases, someone else will certainly use that fossil fuel instead of me.