Soil as Carbon Storehouse: New Weapon in Climate Fight? The degradation of soils from unsustainable agriculture and other development has released billions of tons of carbon into the atmosphere. But new research shows how effective land restoration could play a major role in sequestering CO2 and slowing climate change. By: Judith d. Schwartz In the 19th century, as land-hungry pioneers steered their wagon trains westward across the United States, they encountered a vast landscape of towering grasses that nurtured deep, fertile soils. Today, just three percent of North America’s tallgrass prairie remains. Its disappearance has had a dramatic impact on the landscape and ecology of The world’s cultivated soils have lost 50 to 70 percent of their original carbon stock. soldes coque iphone the U.S., but a key consequence of that transformation has largely been overlooked: a massive loss of soil carbon into the atmosphere. The importance of soil carbon — how it is leached from the earth and how that process can be reversed — is the subject of intensifying scientific investigation, with important implications for the effort to slow the rapid rise of carbon dioxide in the atmosphere. coque iphone According to Rattan Lal, director of Ohio State University’s Carbon Management and Sequestration Center, the world’s cultivated soils have lost between 50 and 70 percent of their original carbon stock, much of which has oxidized upon exposure to air to become CO2. coque iphone 8 Now, armed with rapidly expanding knowledge about carbon sequestration in soils, researchers are studying how land restoration programs in places like the Rattan Lal Soil in a long-term experiment appears red when depleted of carbon and dark brown when carbon content is high former North American prairie, the North China Plain, and even the parched interior of Australia might help put carbon back into the soil. Absent carbon and critical microbes, soil becomes mere dirt, a process of deterioration that’s been rampant around the globe. Many scientists say that regenerative agricultural practices can turn back the carbon clock, reducing atmospheric CO2 while also boosting soil productivity and increasing resilience to floods and drought. Such regenerative techniques include planting fields year-round in crops or other cover, and agroforestry that combines crops, trees, and animal husbandry. Recognition of the vital role played by soil carbon could mark an important if subtle shift in the discussion about global warming, which has been a look at soil brings a sharper focus on potential carbon sinks heavily focused on curbing emissions of fossil fuels. But a look at soil brings a sharper focus on potential carbon sinks. Reducing emissions is crucial, but soil carbon sequestration needs to be part of the picture as well, says Lal. The top priorities, he says, are restoring degraded and eroded lands, as well as avoiding deforestation and the farming of peatlands, which are a major reservoir of carbon and are easily decomposed upon drainage and cultivation. coque iphone He adds that bringing carbon back into soils has to be done not only to offset fossil fuels, but also to feed our growing global population. “We cannot feed people if soil is degraded,” he says. “Supply-side approaches, centered on CO2 sources, amount to reshuffling the Titanic deck chairs if we overlook demand-side solutions: where that carbon can and should go,” says Thomas J. Goreau, a biogeochemist and expert on carbon and nitrogen cycles who now serves as president of the Global Coral Reef Alliance. Goreau says we need to seek opportunities to increase soil carbon in all ecosystems — from tropical forests to pasture to wetlands — by replanting degraded areas, increased mulching of biomass instead of burning, large-scale use of biochar, improved pasture management, effective erosion control, and restoration of mangroves, salt marshes, and sea grasses. “CO2 cannot be reduced to safe levels in time to avoid serious long-term impacts unless the other side of atmospheric CO2 balance is included,” Goreau says. Scientists say that more carbon resides in soil than in the atmosphere and all plant life combined; there are 2,500 billion tons of carbon in soil, compared with 800 billion tons in the atmosphere and 560 billion tons in plant and animal life. And compared to many proposed geoengineering fixes, storing carbon in soil is simple: It’s a matter of returning carbon where it belongs. Through photosynthesis, a plant draws carbon out of the air to form carbon compounds. What the plant doesn’t need for growth is exuded through the roots to feed soil organisms, whereby the carbon is humified, or rendered stable. Carbon is the main component of soil organic matter and helps give soil its water-retention capacity, its structure, and its fertility. According to Lal, some pools of carbon housed in soil aggregates are so stable that they can last thousands of years. This is in contrast to “active” soil carbon, ‘If we treat soil carbon as a renewable resource, we can change the dynamics,’ says an expert. “If we treat soil carbon as a renewable resource, we can change the dynamics,” says Goreau. “When we have erosion, we lose soil, which carries with it organic carbon, into waterways. When soil is exposed, it oxidizes, essentially burning the soil carbon. We can take an alternate trajectory.” As basic as soil carbon is, there’s much scientists are just learning about it, including how to make the most of its CO2 sequestration capacity. One promising strategy, says Goreau, is bolstering soil microbiology by adding beneficial microbes to stimulate the soil cycles where they have been interrupted by use of insecticides, herbicides, or fertilizers. As for agroforestry, programs with greater species diversity are better able to maximize the storage of carbon than monocultures. Many researchers are looking to biochar — produced when plant matter, manure, or other organic material is heated in a zero- or low-oxygen environment — for its ability to turn problem areas into productive sites while building soil carbon. Says Goreau, “Vast areas of deforested land that have been abandoned after soil degradation are excellent candidates for replanting and reforestation using biochar from the weeds now growing there.” An important vehicle for moving carbon into soil is root, or mycorrhizal, fungi, which govern the give-and-take between plants and soil. According to Australian soil scientist Christine Jones, plants with mycorrhizal connections can transfer up to 15 percent more carbon to soil than their non-mycorrhizal counterparts. The most common mycorrhizal fungi are marked by threadlike filaments called hyphae that extend the reach of a plant, increasing access to nutrients and water. These hyphae are coated with a sticky substance called glomalin, discovered only in 1996, which is instrumental in soil structure and carbon storage. The U.S. Department of Agriculture advises land managers to protect glomalin by minimizing tillage and chemical inputs and using cover crops to keep living roots in the soil. In research published in Nature in January, scientists from the University of Texas at Austin, the Smithsonian Tropical Research Institute, and Boston University assessed the carbon and nitrogen cycles under different mycorrhizal regimens and found that plants linked with fruiting, or mushroom-type, fungi stored 70 percent more carbon per unit of nitrogen in soil. Our understanding of how soil life affects the carbon cycle is poised for tremendous growth. coque iphone en ligne driver of carbon storage, particularly “the mechanisms by which carbon can stay in the ground rather than going into the atmosphere.” One implication of this research, says Goreau, is that “the effect of most landscape alterations is to convert them from systems that store carbon efficiently … toward ones that are inefficient in the use of nitrogen, and as a result are losing carbon storage.” By landscape alterations, he means from forest to cropland, or from small farms to industrial agriculture operations that use the chemicals that inhibit the mycorrhizal and microbial interactions that store carbon. Our understanding of soil microbiology and how soil life affects the carbon cycle is poised for tremendous growth, says Goreau. This, he says, is thanks to the burgeoning field of metagenomics, the study of genetic material from specimens taken directly from the environment rather than cultured in a lab. “For the first time,” says Goreau, “we can identify all major soil biogeochemical pathways from the genetic information in the microbes.” Even at our current level of knowledge, many see great potential for storing carbon in soil. Lal of Ohio State says that restoring soils of degraded and desertified ecosystems has the potential to store in world soils an additional 1 billion to 3 billion tons of carbon annually, equivalent to roughly 3.5 billion to 11 billion tons of CO2 emissions. (Annual CO2 emissions from fossil fuel burning are roughly 32 billion tons.) Many call Lal’s carbon soil storage figures low. This could reflect the fact that soil carbon is generally measured in the top 15 to 30 centimeters, whereas soil at depth may store carbon at much higher rates. For example, in land with deep-rooted grasses the soil can go down five meters or more. Research by Australian and British scientists published last year in the journal Plant and Soil examined soils in five southwestern Australia sites MORE FROM YALE e360 As Uses of Biochar Expand, Climate Benefits Still Uncertain Research shows that biochar made from plant fodder and even chicken manure can be used to scrub mercury from power plant emissions and clean up polluted soil. The big question is whether biochar can be produced on a sufficiently large scale to slow or reverse global warming. Those who champion soil carbon for climate mitigation frequently look to grasslands, which cover more than a quarter of the world’s land. According to the UN’s Food and Agriculture Organization, grasslands also hold 20 percent of the world’s soil carbon stock. Much of this land is degraded, as evidenced in the U.S. Great Plains and places like northern Mexico, Africa’s Sahel, and Mongolia. Seth Itzkan — founder of Massachusetts-based Planet-TECH Associates, a consulting firm specializing in restoration ecology — advocates Holistic Planned Grazing (HPG), a model developed by Zimbabwean wildlife biologist Allan Savory. In this practice, livestock are managed as a tool for large-scale land restoration, mimicking the herding and grazing patterns of wild ruminants that coevolved with grassland ecosystems. Animals are moved so that no plants are overgrazed, and grazing stimulates biological activity in the soil. Their waste adds fertility, and as they move in a herd their trampling aerates soil, presses in seeds, and pushes down dead plant matter so it can be acted upon by soil microorganisms. All of this generates soil carbon, plant carbon, and water retention. Savory says HPG doesn’t require more land — in fact it generally supports greater animal density — so it can be applied wherever livestock are raised. In Australia, which has been suffering extreme heat and wildfires, policy-makers are taking seriously programs that build and stabilize soil carbon. The action plan Regenerate Australia outlines a strategy to restore up to 300 million hectares (740 million acres). A core goal is attaining previous soil carbon levels by introducing more sustainable grazing, farming, and water-retention practices. Says Rattan Lal: “Soils of the world must be part of any agenda to address climate change, as well as food and water security.
Wind Power Slashes Carbon Emissions
Wind Power Has Cut U.S. soldes coque iphone pas cher Carbon Dioxide Emissions By 4.4 Percent: Report Kate Sheppard WASHINGTON — The growth of wind power in the United States is putting a significant dent in emissions, according to a forthcoming report from the American Wind Energy Association. Wind generation avoided 95.6 million metric tons of carbon dioxide in 2013, which is equivalent to taking 16.9 million cars off the road. That’s a 4.4 percent cut to power sector emissions, when compared to the level of emissions that would have been generated if that power had come from fossil fuels. Wind proponents say that’s evidence that the wind industry is playing a major role in meeting U.S. coque iphone 2019 soldes emissions goals. “Every time a megawatt of wind power is generated, something else is not generated,” said Elizabeth Salerno, AWEA’s vice president for industry data and analysis. coque iphone There are now 61,000 megawatts of wind power installed in the U.S., with turbines in 39 states. Another 12,000 megawatts of wind power are currently under construction, and power projects for which contracts are signed but construction has yet to start are expected to produce another 5,200 megawatts. coque iphone 8 AWEA says those additional projects should cut another 1 percent of power sector emissions, putting the country closer to the Obama administration’s goal of cutting total U.S. emissions 17 percent by 2020. The switch to natural gas for power generation, spurred by lower prices in recent years, is usually given most of the credit for reductions in emissions from the power sector over the last nine years. But plants now burning gas could switch back to coal if prices go back up, said Salerno, so “those aren’t fixed, permanent reductions.” With wind, she says, “those reductions are locked in.” The AWEA report also found that the expansion of wind energy has helped reduce water consumption by 36.5 billion gallons, or about 116 gallons of water per U.S. resident. coque iphone x Thermal power plants, which include coal, nuclear and some natural gas-fired units, use the fuel source to boil water, which produces the steam that turns the turbines that generate electricity. Plants also require water for cooling, whereas wind turbines do not. soldes coque iphone Jordan Macknick, an energy and environmental analyst at the National Renewable Energy Laboratory, has said that wind is the “clear winner” when comparing the water use of different types of electricity generation. AWEA says two big factors could help boost the continued growth of wind: the extension of the production tax credit, which provides a financial incentive for wind development, and possible changes to the EPA’s emission standards for existing power facilities. Regarding the former, the Senate Finance Committee approved a bill Thursday that would extend the credit through the end of 2015. coque iphone pas cher It had lapsed at the end of the 2013. As for the EPA, it’s still not clear what the standards for emissions reductions from existing power plants will look like. The EPA said Friday that it has sent its draft standards to the Office of Management and Budget for interagency review, and expects to release those draft standards in June, per President Barack Obama’s climate action plan. EPA Administrator Gina McCarthy has said that standards will be crafted in a way that allows states to develop their own feasible emission reduction plans through energy efficiency measures and the increased use of renewable energy. It’s not yet clear, however, how steep the emissions cuts for existing plants will be. It’s also not yet clear how much of a state’s compliance with the standards will be expected to come from changes inside the power plants — such as efficiency or technology upgrades — or from added capacity via renewables. AWEA argues EPA could “set the standard pretty aggressively” for states to use additional generation from wind and other renewables to comply.