why do we always think that policy makers need more evidence/facts to change their mind? 20 years ago the role of women was already stated in IWRM's third principle : it was based on evidence, wasn't it?

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why do we always think that policy makers need more evidence/facts to change their mind? 20 years ago the role of women was already stated in IWRM's third principle : it was based on evidence, wasn't it?