In Climate Justice, a bracing challenge to status-quo thinking on the ethics of climate change, renowned author and legal scholar Cass Sunstein clearly frames what’s at stake and lays out the moral imperative: When it comes to climate change, everyone must be counted equally, regardless of when they live or where they live - which means that wealthy nations, which have disproportionately benefited from greenhouse gas emissions, are obliged to help future generations and people in poor nations that are particularly vulnerable.