MISSION BAY, Calif. -- An important part of California's coastal ecosystem, eelgrass, is disappearing, with 90% gone since the 1950s.

A report commissioned by The Pew Charitable Trusts found 50% to 65% of the eelgrass restoration efforts are successful. The study showed the choice of where to replant is the most important factor.

Melissa Ward, post-doctoral researcher at San Diego State University and co-author of the report, said eelgrass has many benefits.

"It can improve water quality. It stabilizes the sediment. It also acts as a nursery habitat for a lot of baby animals, like Dungeness crab, California spiny lobster, halibut and Pacific herring," Ward outlined.

The research pulled together dozens of studies to establish best practices for eelgrass restoration.

Eelgrass is abundant in Humboldt Bay up north. It is being restored in Mission Bay in San Diego, and a community program to restore it in Newport Bay has been very successful. But Morro Bay, for example, lost 97% of its eelgrass from 2007 to 2017 due to variations in water circulation and sediment, from natural causes and man-made changes to the harbor.

Lexie Bell, executive director of the Morro Bay National Estuary Program, who also serves on the steering committee for the Pacific Marine Estuarine Fish Habitat Partnership, which released the study, noted the role eelgrass restoration can play in the fight against climate change.

"Eelgrass can help reduce erosion, and that can be a factor with coastal flooding," Bell explained. "And it absorbs carbon, so the more eelgrass you have, the more carbon it can absorb."

Ward emphasized she'd like to see California develop and fund a standard monitoring program for eelgrass.

"We know it's super important, but we have no funding to even monitor on a statewide level where seagrass is and how quickly it is being lost," Ward pointed out.

She added people can help by making sure not to drop anchor in an eelgrass bed while boating, and by supporting efforts to reduce polluted runoff into the sea.

Support for this reporting was provided by The Pew Charitable Trusts.

Small sections of the kelp forests off the Mendocino coast are starting to recover with improved environmental conditions, thanks to a conservation program which sent divers to remove 45,000 pounds of purple sea urchins.

The urchins have devastated the once massive bull kelp forests, leaving a lifeless barren behind.

Dan Abbott, kelp forest program director for the Reef Check Foundation, said it is the first large-scale kelp-restoration project of its kind in northern California.

"It's not back to where it was, say pre-2015," Abbott acknowledged. "It's still only about 20% of the historical average. But again, it's only like a year and a half in. And it's a very encouraging result."

The purple sea-urchin population has exploded in the last eight years or so, partially because a wasting disease has decimated their chief predator, the sea star. In addition, the area has no sea otters to keep the urchins in check, because the otters were hunted to extinction in the early 1900s.

Sheila Semans, director of the Noyo Center for Marine Science in Fort Bragg, said the kelp forests there have recovered 5 to 10 percent - and serve as crucial habitat for hundreds of species.

"The sea lions hunt in it, the abalone eat it, the rockfish hide in it," Semans outlined. "There's just so many ecosystem services that it provides. On top of that, it sequesters carbon, and it buffers wave action along the coast."

The Noyo Center also is working to create a new fishery for purple urchins, which can be fattened up in an aquaculture facility and sold. The California Department of Fish and Wildlife said it plans to develop a comprehensive statewide Kelp Recovery and Management Plan over the next five to 10 years.

Support for this reporting was provided by The Pew Charitable Trusts.

Marine-conservation groups are celebrating after the U.S. House passed the America COMPETES Act on Friday.

The bill primarily boosts semiconductor production in the U.S. but a lesser-known provision would phase out an older type of fishing gear called drift gill nets in federal waters, something environmental groups have sought for decades.

Ben Enticknap is Pacific campaign manager and senior scientist at the nonprofit Oceana. He said the mile-long, nearly invisible gill nets are incredibly dangerous for marine life.

"They are set at night in the epicenter of ocean wildlife off the coast of southern California to catch swordfish," said Enticknap. "But they also catch whales, dolphins, sea turtles, sharks and many, many other animals."

The state of California already is phasing out its state drift gillnet permit program, which offers fishing crews cash to turn in their nets and permits, and helps them buy a new, safer type of gear called deep-set buoy gear.

All but four fishing boat captains in Southern California have begun the transition - and those four will have to follow if the bill becomes law.

Opponents of the bill, referring primarily to its provisions on manufacturing, say it is not tough enough on China.

Enticknap noted that it also would ban the sale of shark fins in the United States.

"We've already prohibited shark fins in California and Oregon and Washington," said Enticknap. "And this kind of takes that same approach that's already been passed by a number of states and makes it national."

A version of the COMPETES Act already has passed the U.S. Senate. Now the two have to be reconciled and passed again in both chambers before the final version can go to President Joe Biden's desk.

SAN DIEGUITO LAGOO, Calif. - Coastal protection groups are pressing California to prioritize so-called "blue carbon" ecosystems in the fight against climate change.

Dozens of groups have sent a letter to the head of the California Natural Resources Agency - asking for action to protect existing wetlands and near-shore areas, and restore those that have been degraded.

Gilly Lyons, an officer with the Conserving Marine Life in the United States program of The Pew Charitable Trusts, is among those who signed the letter.

"The request from the signers is to protect biodiversity, to store and sequester carbon, and to mitigate the effects of climate change that we're already living with," said Lyons, "things like ocean acidification, storm surges, coastal flooding, etc."

The letter comes during the public comment period for a draft of the CNRA's new "Natural and Working Lands Climate Smart Strategy," to be finalized early next year.

Last year, Gov. Gavin Newsom issued an executive order requiring state agencies to act to accelerate the natural removal of carbon and build climate resilience, especially in lower-income communities.

Angela Kemsley is conservation and communication manager at the group WILDCOAST, which is currently restoring two lagoons in San Diego County. She said natural features like eelgrass beds are important tools in climate mitigation.

"They're actually much more efficient at storing this carbon than land-based plants," said Kemsley. "And so, they're able to take a bunch of carbon out of the atmosphere, store it in the soil - and that helps to fight climate change."

According to the U.S. Fish and Wildlife Service, 90% of California's historic wetlands have been drained for agriculture and development over the past century.