Grey's view on grand challenge.
As for a ‘grand challenge’, I see the biggest open challenge as about
how to build models that learn. That is, how do we leverage the power of
machine learning and modern inference techniques for learning
multi-scale physical and emergent
principles in watersheds and complex systems? How do we construct
models that allow for direct learning form data, but also allow us to
prescribe what we do know about the biogeophysics of ecohydrological