Professors Mary Casswell Stoddard and David Wilcove discuss how healthy ecosystems on vital areas such as food, medicine and climate — and ... ... <看更多>

Biodiversity is under intense pressure from human activity worldwide. David Attenborough explains why biodiversity is so important to humans ... ... <看更多>

View full lesson: http://ed.ted.com/lessons/why-is- biodiversity -so- important -kim-preshoff Our planet's diverse, thriving ecosystems may seem ... ... <看更多>