ABSTRACT
However, this affi rmation of the duty to mitigate climate change does not in itself tell us how much we must do-the second key question of climate ethics. An answer to this question needs to be based on theories of intergenerational justice. In Part II , we criticized arguments for a duty to bequeath a better world to our descendants. We suggested that rather there is a duty to bequeath enough to our descendants-for example enough for human rights to be fulfi lled-and that there might well also be a duty to ensure that they are not worse off than we are. How much eff ort is needed on our part if we are to leave enough or equally much for our descendants depends crucially on two further factors: uncertainty about the future, and inequality in the future. Taking these two factors into account points toward a strong duty to protect the climate.
