US Plans Wind Farms Along Nearly the Entire U.S. Coastline

Reaching the 2050 climate targets are usually put in terms of increasing the share of wind and solar by such and such a percent every year until 2050. I wonder though how quickly we will use up all of the "low-hanging fruit" locations, leaving only very high maintenance cost areas or very low wind areas.

It might be much more difficult in future decades to get a good return on a given $1B wind investment in later years than it is now. This would considerably hamper our ability to hit the target.

Any estimate how many birds and bats this would kill each year?