3 billion birds: More than a quarter of all birds have disappeared from North America since 1970

GettyImages 157477304 0’One of the great environmental crises today — and there are many — is the loss of biodiversity on planet Earth. Human actions have lead to an extinction rate higher than anything seen on Earth in the last 10 million years, as a sweeping UN report recently explained. It’s estimated the average vertebrate (bird, fish, mammal, amphibian) population has lost around 60 percent of its individual members since the 1970s.

Scientists keep telling us that something is going devastatingly wrong in the natural world. Today, a study in Science focuses on the birds of North America, and the results are again eye-opening and grim.

A team of scientists at the Cornell Laboratory of Ornithology, in collaboration with the US Geological Survey and several conservation groups, have estimated North America has lost nearly 3 billion birds since 1970. That’s an estimated decline of 30 percent in the total bird population. In other words: More than one in four birds has disappeared from American skies in the last 50 years.…’

Via Vox