the global water cycle is a global common good, we just don�*t want to understand it because we believe water belongs to us. we need to invest with that in our minds. the report notes that water scarcity has the greatest impact on poorer people and children. unicef had recently warned that 190 million children in ten african countries don�*t have access to clean water. the un says current levels of investment would have to be tripled to get safe drinking water for all by 2030. aruna iyengar, bbc news. stay with us on 0utside source — still to come. the uk parliament wins a vote on a new agreement for post—brexit trade in northern ireland, we�*ll take a look at what it all means.