1 Global Institute for Water Security and School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Saskatchewan S7N 3H5, Canada.
2 Department of Geography, University of Calgary, Calgary, Alberta T2N IN4, Canada.
3 School of Geosciences, University of Aberdeen, Aberdeen AB34 3FX, UK.
4 Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, USA.