Introduction

One of the most discussed issues in the first half of the twenty-first century is the struggle against climate change and the subsequent crucial question is whether the shortages in water worldwide may be related to climate change [1-5]. As a consequence, water management becomes a factor playing a decisive role in the social, economic and even political sphere, which occasionally causes political tensions in a number of regions because of virtual or real lack of water. The geological approach to this issue brings new aspects and scales calculating with tens of millions of years, which are free of subjective and short-term perception of the present short or transient problems or trends.

Water Research Institute TGM, Podbabska 2582, Praha 6, Czech Republic and

Faculty of Science, Charles University, Albertov 6, Praha 2, Czech Republic e-mail: [email protected]

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