Just to put the number of 1,000 to 28,000 birds per year in perspective. If you do the math for birds killed by house-cats (1.3-4 billion birds a year in US) into the square miles of the united states. You end up with house-cats killing 350 to 1078 birds per square mile per year. Of course this is a silly approximation, but large numbers are harder to grasp than small ones without mental tools like this.<p>Anyway, while killing birds with solar death beams is bad, I don't think it's bad enough to halt the progress. I mean, at least build a solar death array that can outdo mittens.