Offsetting, Denialism, and Risk

In Climate Matters John Broome defends two claims. First, if you live a “normal life” in a rich country, you will probably cause significant harm by your emissions of greenhouse gas (GHG), violating a moral duty of harm-avoidance. Second, you can satisfy this duty by offsetting your emissions. Some would deny Broome’s first claim on the grounds that an individual’s emissions of GHG do no harm. Broome calls this position “IndividualDenialism” (ID) and in a recent paper he attempts to refute it. I explain how, if Broome’s refutation of ID were successful, it would undermine his claim that you can satisfy your duty of harm avoidance by offsetting. I suggest an alternative defence of the claim that you can satisfy your individual duty to reduce your carbon footprint by offsetting. This alternative defence assumes that your duty to reduce your carbon footprint derives from a duty of risk-avoidance.