Butterfly population declining at 'catastrophic' rate, research says
An alarming new study shows the overall population of butterflies is declining sharply. NBC News' Maya Eaglin spoke with scientists about why it's happening and how to stop it. For more context and news coverage of the most important stories of our day, click here: https://www.nbcnews.com ยป Subscribe to NBC News: http://nbcnews.to ...
