Living without sanitation is endangering the health and livelihoods of the world’s poorest people. A staggering two billion still do not have access to a decent toilet. Now, climate change is aggravating this sanitation crisis. In this briefing, 'Living in a fragile world: The impact of climate change on the sanitation crisis', highlight the link between poor sanitation and the transmission of fatal – but preventable – illnesses, and examine how this is now compounded by the effects of climate change.