Those of us who care about global justice and climate justice need to take human population growth seriously. Or so I argued in the first instalment of this two-part blog. On current population forecasts, our grandchildren or great-grandchildren might have to decide between basic rights for their own generation and protecting future generations from climate change. We owe it to them not to bequeath this tragic choice. However, it is also morally crucial to address population in the context of concerted efforts to tackle both global injustice and climate change, not as a standalone problem.