| | |  Editorials | Environmental | August 2008 
Turning Tables on Melting Ice Sheets
 Marla Dickerson - Los Angeles Times
go to original
| | Analyzing recent projections of ice melt occurring in the Antarctic and Greenland, Carl Hodges calculates that diverting the equivalent of three Mississippi Rivers inland would do the trick. | | |
Tastiota, Mexico - A few miles inland from the Pacific Ocean, amid cracked earth and mesquite and sun-bleached cactus, neat rows of emerald plants sprout from the desert floor.
The crop is salicornia. It is nourished by seawater flowing from a man-made canal. And if you believe the American who is farming it, this incongruous swath of green has the potential to feed the world, fuel our vehicles and slow global warming.
He is Carl Hodges, a Tucson, Ariz., atmospheric physicist who has spent most of his 71 years figuring out how humans can feed themselves in places where good soil and fresh water are scarce.
Hodges is the founding director of the University of Arizona's Environmental Research Lab, and his work has attracted an eclectic band of admirers. They include heads of state, corporate chieftains and Hollywood stars, among them Martin Sheen and the late Marlon Brando.
Through the years, Hodges' knack for making things grow in odd environments has been on display at the Land Pavilion in the Epcot theme park at Walt Disney World in Florida and the Biosphere 2 project in Arizona.
Here in the northern Mexican state of Sonora, he's thinking much bigger.
Earth's ice sheets are melting. Scientists predict that rising seas could swallow some low-lying areas, displacing millions of people.
Hodges sees opportunity. Why not divert the flow inland to create wealth and jobs instead of disaster?
He wants to channel the ocean into man-made "rivers" to nourish commercial aquaculture operations, mangrove forests and crops that produce food and fuel. This greening of desert coastlines, he said, could add millions of acres of productive farmland and sequester vast quantities of carbon dioxide, the primary culprit in global warming. Hodges contends that it also could neutralize sea-level rise, in part by using exhausted freshwater aquifers as gigantic natural storage tanks for ocean water.
Three Mississippis
Analyzing recent projections of ice melt occurring in the Antarctic and Greenland, Hodges calculates that diverting the equivalent of three Mississippi Rivers inland would do the trick. He figures that would require 50 good-sized seawater farms that could be built within a decade if the world gets cracking.
"The only way we can stop [sea-level rise] is if people believe we can," Hodges said. "This is the big idea" that humanity has been waiting for, he believes.
With his trademark floppy hat, an iPhone wired perpetually to his head and a propensity to assign environmental reading homework to complete strangers, Hodges might be dismissed by some as an eccentric who has spent too much time in the Mexican sun.
"When I first met Carl, I thought he was a philosopher," said Sheen, a longtime friend.
Still, experts including Dennis Bushnell, chief scientist at the National Aeronautics and Space Administration's Langley Research Center, say seawater agriculture could prove to be an important weapon against climate change.
Hodges already has built such a farm in Africa. Political upheaval there shut much of it down in 2003. That's why he's determined to construct a showcase project in North America to demonstrate what's possible.
Enter salicornia
All he needs now is $35 million. That's where salicornia comes in.
A so-called halophyte or salt-loving plant, the briny succulent thrives in hellish heat and pitiful soil on a little more than a regular dousing of ocean water. Several countries are experimenting with salicornia and other saltwater-tolerant species as sources of food. Known in some restaurants as sea asparagus, salicornia can be eaten fresh or steamed, squeezed into cooking oil or ground into high-protein meal.
Hodges, who heads the nonprofit Seawater Foundation, plugged salicornia for years as the plant to help end world hunger. Do-gooders applauded. The private sector yawned.
Then oil prices exploded. Hodges saw his shot to lift his fleshy, leafless shrub from obscurity.
That's because salicornia has another nifty quality: It can be converted into biofuel. And, unlike grain-based ethanol, it doesn't need rain or prime farmland, and it doesn't distort global food markets. NASA has estimated that halophytes planted over an area the size of the Sahara could supply more than 90 percent of the world's energy needs.
Last year, Hodges formed a for-profit company called Global Seawater Inc. to produce salicornia biofuel in liquid and solid versions.
Seed for venture
The enterprise recently planted 1,000 acres of salicornia here in rural Sonora, where Hodges has been doing preparatory research for decades. That crop will provide seed for a major venture planned 50 miles north in the coastal city of Bahia Kino. Global Seawater is attempting to lease or buy 12,000 acres there for what it envisions will be the world's largest seawater farm.
The plan is to cut an ocean canal into the desert to nourish commercial ponds of shrimp and fish. Instead of dumping the effluent back into the ocean, the company would channel it further inland to fertilize fields of salicornia for biofuel. The seawater's next stop would be man-made wetlands. These mangrove forests could be "sold" to polluters to meet emissions cuts mandated by the Kyoto Protocol on climate change.
"Nothing is wasted," Hodges said.
Global Seawater already has a small refinery to process salicornia oil into liquid biodiesel, which Hodges believes can be produced for at least one-third less than the current market price of crude oil. Leftover plant material would be converted into solid biofuel "logs" that he said burn cleaner than coal or wood.
Some environmentalists are dubious. Wheat and cotton flourished here until farmers pumped aquifers nearly dry. Shrimp aquaculture operations have fouled the Sea of Cortez with waste.
Channeling millions of gallons of seawater inland could have similar unintended consequences for fragile deserts, said biologist Exequiel Ezcurra, former head of Mexico's National Ecology Institute. |
|
| |
Vallarta Weddings
Tell a Friend
Site Map
Print this Page
Email Us