 It is helpful here to focus on responsibilities to mitigate since there has been considerable debate among philosophers as to whether individuals have responsibilities to limit their own personal emissions or not. Some, like Walter Sinnott-Armstrong, are sceptical of the proposition that individuals have duties to limit their own emissions. He considers a large number of separate commonsense moral principles and argues that none of these can be marshalled to show that individuals have a duty to limit their own emissions. One central theme in his argument is that individuals’ personal emissions make no difference (Sinnott-Armstrong 2010).