[RWebb]

nothing is totally benign - for energy sources, I'd rank PV solar as nearly benign with wind next in line

habitat loss is the #1 problem for all birds and most other animals also - that new shopping mall the wife likes so much

cats are the #1 predator on birds in suburbia, exurbia and rural area (i.e. everywhere outside of Wilderness) - that is a human caused loss, of course

wind turbines can be a major killer of birds if they are improperly sited (some old installations were in the middle of migration routes)

the big effect we are seeing in some areas is bats - they have some studies going to test ultrasonic emitters on the blades to warn or scare away bats from the immediate area