California removed millions of purple urchins; 55 acres of kelp forest returned

Off the coast of Southern California, an underwater kelp forest once thrived but was reduced to a desert-like landscape due to an invasion of purple sea urchins. In 2013, a team comprising scientists, conservationists, and commercial urchin fishermen began a massive urchin removal effort. Over seven years, more than 8,000 hours of underwater labor were dedicated to harvesting approximately 4.2 million urchins.

This restoration led to the return of over 55 acres of kelp forest by 2020, creating a new habitat for marine life and revitalizing areas previously dominated by barren rock and urchins. This success story illustrates the importance of collaboration among various stakeholders in conservation efforts and the broader impact of pollution and oil spills on marine ecosystems.