If mitigation is about energy, adaptation is about water. This is the opening statement of a new essay on water and adaptation, written by two of the worlds leading profiles in the water sector, professor Torkil Jønch Clausen of DHI and Carsten Bjerg, CEO of Danish technology provider Grundfos. The essay highlights the urgent need for effective measures to protect the worlds most vulnerable communities from the effects of floods, extreme wheather, drought and rising sea levels.