Leading bird and nature groups are trying to save what they call North America's "bird nursery."
They want the Canadian and U.S. governments to protect at least half of the continent's boreal forest from industrial development.
The boreal forest is a vast northern swath of trees stretching from Alaska to Labrador. Scientists say the "Boreal Birds Need Half" campaign is a unique chance to protect a forest that is still largely untouched.
"In the rest of the world, much of that kind of...