Migrating birds are not taken into account with this Japanese inventor whatsoever. All the more reason to keep the spinning blade diameter SMALL, decentralized and powering a family household. I've never seen it fail, whether it is centralized windpower, solar, septic, city water, coal, nuclear. ANYTHING that is centralized, and the family unit not empowered to do it all by themselves, is going to destroy the wildlife and their habitat. It's because, when these ideas are scaled up, they're just TOO BIG for the ecosystem to get around. What comes next is shredded tweet, and dead bats in LARGE numbers. Scientists designing these monstrosities better wake up and get a clue about their money-making madness, before it all comes back to haunt them, when they and their own OFFSPRING are directly affected by their mega-size contraptions. Just like people getting gold fever, groups of people can allow themselves to get infected with MONEY fever. Never enough, and always piling up larger and larger numbers in the bank. FOR WHAT END? Why are we here on this third rock from the sun in the first place? To make GIANT windpower stations, destroy the ecosystem in the process, and make a handful of people very wealthy? I think not. And it turns out that that size appears to be the family unit. And, as the appliances get more energy efficient, then we won't need near as much electricity to do the same task. Flying downwind of a 100's ft dia. spinning windpower behemoth, this is what happens to their lungs, they EXPLODE. No bats, no pollination, the house of cards comes tumbling down. It is only when they get so large, and the vacuum vortex so great, that it OVERWHELMS anything flying by from escaping its vortexian clutches.