text: Impacts on freshwater were assessed with a version of the JULES land surface model [24,25], a 
  coupled ecosystem–hydrology–surface exchange model which simulates land-atmosphere ﬂuxes 
  of water, energy and carbon in an internally consistent way, typically applied at global scales. 
  Variants of JULES form the land surface scheme of Met Ofﬁce Hadley Centre Earth System 
  Models [26,27] and have been used to assess impacts of climate change on global terrestrial 
  ecosystems and hydrology [28–30] within such models. JULES can also be used outside of the 
  Earth System Model (ESM), driven by meteorological outputs of other ESMs to assess impacts of 
  a wider range of climate projections [6,8]. Here we use a new, higher-resolution conﬁguration of 
  JULES on a global grid of 0.5° resolution [31]. 
  
  It has been noted that hydrological impacts models driven by climate-change projections 
  from climate models tend to give more severe drying than simulated in the climate models 
  themselves [32–34]. This is largely attributed to the inclusion of plant stomatal closure in 
  response to elevated CO2 in the climate model land surface schemes, which generally reduces 
  evapotranspiration relative to climate projections without this process and hence further increases 
  run-off/streamﬂow or ameliorates decreases [34]. This process is often omitted from standard 
  hydrological models. Plant physiological responses to CO2 are included in the JULES model, so 
  our projections of changes in run-off here do account for this process. 