According to their research report by the Jet Propulsion Laboratory, the USA's space agency NASA has confirmed that human activity is responsible for a massive redistribution of freshwater across Earth. It said the redistribution is continuing as populations shift and ＿＿（31）＿＿ for food increases. In particular, equatorial regions were ＿＿（32）＿＿ , while tropical areas and higher latitudes were gaining water supplies. NASA warned that if this trend continued, many highly populated urban areas would struggle to find ＿＿（33）＿＿ water in the future. NASA's claims are the result of a 14-year study into shifting locations and ＿＿（34）＿＿ resources of freshwater. It was part of a mission ＿＿（35）＿＿ between 2002-2016 called GRACE, which is an acronym for Gravity Recovery and Climate Experiment. Researchers say that the shifting freshwater patterns are the result of human activity.