Scientists are worried temperatures are rising more quickly than previously realized; a newly published report backs up that analysis.

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

A new study finds North American bird populations keep dropping, and that decline is speeding up for many species. ......

Billions fewer birds are flying through North American skies than decades ago and their numbers are shrinking ever faster, mostly due to the...