Billions of birds that once filled North American skies have disappeared, and new science shows they are disappearing faster than ever.

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

A new study has revealed a startling side effect of rising global temperatures. According to reports by the Straits Times, tropical bird populations are experiencing significant declines due to ...

Depopulation — unremitting, long-term population decline — promises to be the 21st century’s most important demographic trend. After centuries of seemingly unstoppable increase, world population is on ...

Scientists studying data collected over more than three decades found accelerating losses. Their research offers clues about the causes.

The United States has enjoyed some level of population growth virtually every year for more than a century. But that doesn't mean every state is always growing in lockstep. Here's a for-instance: ...

According to a new study by the Museo Nacional de Ciencias Naturales (MNCN-CSIC) and the National University of Colombia, chronic ocean warming is driving a nearly 20% annual decline in fish biomass.