アメリカ人にとって虫の経済効果は570億ドル
A new study in the April issue of the journal Bioscience shows that insects provide services worth more than $57 billion to Americans. Insects are food for wildlife that supports a $50 billion recreation industry. Native insects provide more than $4.5 billion in pest control, pollinate $3 billion in crops, and clean up grazing lands with a subsequent savings to ranchers of more than $380 million.
by 小橋昭彦 : 06年04月07日
