On the California coast, divers armed with hammers crush purple urchins that have ravaged most of the state’s iconic kelp forests. It’s one of several initiatives to restore leafy marine ecosystems threatened by warming ocean waters. (Dec. 9) (AP Video: Terry Chea)

Divers fight to save California’s kelp forests threatened by warming ocean waters

On the California coast, divers armed with hammers crush purple urchins that have ravaged most of the state’s iconic kelp forests. It’s one of several initiatives to restore leafy marine ecosystems threatened by warming ocean waters. (Dec. 9) (AP Video: Terry Chea)