First, I often heard the argument that wind turbines are quite bad for the wild bird populations, yet Jacobson does not mention it in his rather brief section on environmental impact. How much truth is in this claim?
Second, some time ago you mention another option - high altitude wind turbines (suspended by propellers.) Jacobson does not seem to mention this option. Any idea why and how would this change his argument about the need for a backup hydro system?
Wojtek