More than a third of all tree species worldwide face extinction, threatening ecosystems, plants, animals and economies around the world, experts warned Monday. In all, 38% of trees are at risk, ...

David Attenborough explores the extinction crisis and how it drives pandemic diseases. With a million species at risk of extinction, Sir David Attenborough explores how this crisis of biodiversity has ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The most famous of ...

The debate has raged for decades: Was it humans or climate change that led to the extinction of many species of large mammals, birds, and reptiles that have disappeared from Earth over the past 50,000 ...

Around 252 million years ago, life on Earth suffered its most catastrophic blow to date: a mass extinction event known as the “Great Dying” that wiped out around 90% of life. What followed has long ...

Nicotine & Tobacco Research, Vol. 16, No. 12 (December 2014), pp. 1599-1605 (7 pages) Introduction: Retrieval (reactivation) of smoking-related memories is a potent trigger of relapse among ex-smokers ...