Where are we heading to? Are we really making correct estimates? How are we handling the issues of heterogeneity? How certain/uncertain are our estimates? I wonder if there is someone who can make this clear for me. The level of our today's technology is not error free even at local scales. Why are we rushing to publish global-scale studies, where we have no know-how on how the systems everywhere work? Is it science? And, are we where we should be?
I know too little about these estimations, but I think far more important is how much water is available to human use. Here I would look more at regional / local estimates, which are the result of weather as well as estimates of groundwater and other sources of water. Here I think that estimates are relatively robust.
yes the global concern increase to measure natural resources and predictions of resources
estimation are correct because they are mathematically proved
it comes under science and technology
Nagalakshmi Radhakrishnan
What's your measure of certainty? Geology, for example, changes in orders of magnitude. And, aquifer characteristics varies with the spatial variability in geologic formations, so does groundwater. Let alone the global estimations, local and regional estimations, as Eberhard Weber said, have huge uncertainty levels. So, how can you say they are all correct? What's your base to say this? Can you share us more?
Global scale estimates may not accurate in some cases, however, R&D is required since global scale values are important in some fields. For example, in LCA studies, global products exists. Hence we need the global impacts. So we need global values.
I agree with Amila, it might be more accurate and also more useful to look at resources issues from a local or regional perspective.....
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