I'll let you and Pitt duke it out over the global prospects of hydro, and you and Nick can hash out the potential of wind while you're at it. For now I'm content to split the difference and disappoint both sides.

Significant hydro development may be confined to China and Canada, but I'd bet South America and Russia will put on a push as well. Regarding wind and solar, ¿Quién sabe?

I'll let you and Pitt duke it out over the global prospects of hydro

No need for duking - we're gathering evidence, not disagreeing.

LevinK is pointing out that hydro production is falling in some places, although - as your graph shows - it's still growing overall and is currently at its highest level ever. I'm pointing out that substantial hydro potential still exists, even in some developed countries. No conflict.