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Earth Focus
How Purple Sea Urchins are Taking Over California's Coastal Waters
Certain circumstances in the ocean can lead to "urchin barrens," where urchins dominate the ocean floor and mow down kelp forests. And without kelp, abalone are left to starve. But while urchin barrens may seem like a win for the species, the imbalance eventually leaves them malnourished. A healthy balance of diverse species is essential to thriving near-shore ecosystems.
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25:26
Two cities, San Francisco and Freetown, brace for climate change using vastly different methodologies.
25:58
Droughts and floods are driving many people away from their rural, farming communities into big cities.
25:30
Forecasts are dire for Louisiana to experience the second-highest sea level rise in the world. How is the region adapting?
26:40
“Vanishing Coral” presents the personal story of scientists and naturalists who are working with local communities to protect coral reefs that are being destroyed by warming seas, pollution, and destructive fishing practices.
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"Earth Focus" looks at three countries on the new fracking frontline: South Africa, Poland, and the UK.