Introduction Asthma is a chronic respiratory disorder requiring ongoing medical management. This ecological study ...

Millions have seen the heart-wrenching video of a polar bear clinging to life, its white hair limply covering its thin, bony frame. Shot by Paul Nicklen and Cristina Mittermeier of the nonprofit group ...

How the world’s forests have transformed in the past two decades How the world’s forests have transformed in the past two decades 4 solutions for trees and forests threatened by a hotter world 4 ...