"Based on this figure, the authors estimate that about 16.7 million reservoirs larger than 0.01ha may exist worldwide. The team also found that nearly 50 per cent of large rivers -- that is, those with an average flow of more than 1000m3 per second -- are affected by large dams and reservoirs worldwide" (via ScienceDaily)
Wow, 17 million dams for 7 billion people, that makes one dam for about 400 people each. That is a lot of rivers and creeks not flowing free anymore.
Wow, 17 millionen Dämme für 7 Milliarden Menschen, da kommen auf einen Damm gerade mal 400 Menschen. Das sind verdammt viele Flüsse und Bäche die nicht mehr frei fliessen können.