[bee_rider]

Unless I'm misreading the chart, it seems to compare quite well to coal and oil, and in line with natural gas. Why would that be contentious?

The only quibble I'd have is that dams serve multiple purposes -- they could help prevent flooding and help out with agriculture. So in some sense a dam could be helping to save lives (apart from the obvious benefits of... having electricity). This seems like a unique perk.

[arcticbull]

The same is true of any bridge past a cliff edge.

[bee_rider]

Err, I'm not sure I follow sorry, is this an expression?

Edit: Oh -- I mean unique among power sources, not unique in general. Clearly other things exist to save people.