This question was asked about trees last year and researchers delivered an answer. However something about this seems categorically wrong. Despite how well intentioned this might be, is this the world we want to live in where we now have to quantify all of nature to justify treating it with care? And if Americans value birds the way Seattle (population 650,000) at $120 million, does that mean birds are worth $58 billion to all Americans when you adjust for population? And what price tag do you put on the nearly 1 billion birds killed every year by buildings? Or the 3.7-20 billion birds killed by cats?
What does this mean to our urban landscape, particularly green roofs? Should we install more green roofs to protect "our investment"? Or can we just say birds are priceless and we should do whatever we can to ensure their survival.
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