I've just read the following report on website motherboard.vice.com:
Two months ago, 34 birds were found dead or injured
on the site of the Ivanpah solar plant owned by BrightSource Energy in
east San Bernardino County, California. Almost half suffered from singed
feathers after running afoul of the plant’s reflected beams of
sunlight, according to a report from The Desert Sun. This
was not an isolated incident: another 19 were found dead at the
500-megawatt Desert Sunlight plant, which is also located in California.
So what’s going on here? Why are birds dropping like their winged-brethren, flies, around these plants and what can we do?
The
Californian desert has become a popular place to build solar energy
plants because of the abundant space and, of course, the sun. However,
the region also serves as one of the four major north-to-south
trajectories for migratory birds: the Pacific Flyway. So while it seems like an ideal locale, birds who fly over these structures face some new and unusual hazards.
When
it comes to death by solar farm, birds typically die in one of two
ways. In the first, the glimmering sheer of solar panels might trick
birds into thinking they are actually part of a body of water. And so
the birds, especially waterfowl in this scenario,
dive towards the panels, looking for moisture and food, only to find
themselves, bones broken, dying in the middle of the arid California
sand.
Blunt
force trauma aside, others feel the wrath of the harnessed sunlight. At
the right (or really, wrong) angle, the potent radiation bouncing off
solar mirrors are enough to burn a bird’s fragile wings, abruptly
sending the creature downward towards the ground and impending death.
They’re like tragic avian Icaruses, except without an easily digestible
moral lesson behind their fatal crashes.
Anthropogenic
threats to birds are everywhere, but they vary according to the
environment. In cities, the seeming invisibility of windows confuse the
animals, who smash into the impenetrable glass barriers headfirst, an
accident that can either stun or kill. Statistics differ: the American
Bird Conservancy cites the annual number of bird deaths via window
strikes at 300 million to one billion birds whereas the US Fish and Wildlife Service says its anywhere from as low as 97 million upwards to 972 million.
Whatever
the actual number, it’s clear window strikes are a major concern, even
causing some urban planners and architects, like those in Portland,
to reconsider building methods. Will massive solar projects become the
desert’s equivalent, inadvertently perplexing birds and luring them to
their doom?
Since
solar technology is still a neophyte in the world of energy solutions,
we can’t yet know. So far, the numbers at single sites are comparatively
low. But numbers only tell a part of the story: some of the
victims are endangered or otherwise protected by the federal government
under the Migratory Bird Treaty Act. That should undoubtedly factor into
future discussions on this issue.
In the future, scientists will need to undertake studies of
the interactions between migratory birds, their travel patterns, and
humanity’s quest for solar energy. Answers will not be quick to
obtain. Much more research has been conducted on how wind power and birds mix, and the scant research covering bird mortality and solar plants is based on plants much smaller than the projects being built today.
Ultimately,
when the research is complete, sorting out this scenario will involve
an unpleasant and morbid calculus. What can be done to minimize
migratory bird mortality? And since no solution will likely ever be
perfect, how many birds might we “permit” to die? Thankfully, the
current impact is quite low, but questions like these serve as a
necessary reminder that even green projects have an impact on their
surrounding environment.
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