Newslettercommons.wikimedia.org Researchers report a staggering decline in wildlife. Here's how to understand it The latest update to an important assessment found that populations had declined by an average of 69 percent since 1970. But that might not mean what you think.
Politics www.huffingtonpost.com Lights go out around the world for 'Earth Hour' to highlight climate change A record number of countries and territories participated in this year's event.
