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Biosphere change may lead to planetwide tipping point


Narrator:       This is Science Today. A group of scientists from around the world are warning of a planetwide tipping point due to irreversible change in the biosphere. Integrative biologist Anthony Barnosky of the University of California, Berkeley, explains that their data suggests there will be a reduction in biodiversity due to factors such as population growth and climate change. This can severely impact much of what we depend on, including agriculture and clean water.

Barnosky:      We can look into the past and we can see that Earth has undergone these tipping points before. We're seeing faster rates of climate change, more disturbance of the land, higher rates of extinction, so I think it's pretty clear that we're headed for something big. We need to plan for the future, to plan for the long term and drive the planet in directions that we want it to go, rather than just using what we want left and right and just assuming everything's going to come out all right. We're past that point.

Narrator:       For Science Today, I'm Larissa Branin.