Cambio climático: ¿esta solución natural es la más efectiva para combatir el calentamiento global?

Un nuevo estudio asegura que existe un área del tamaño de Estados Unidos disponible para plantar árboles en todo el mundo, y que esto podría tener un impacto dramático en la lucha contra el cambio climático.

El estudio muestra que el espacio descrito para sembrar nuevos árboles es mucho mayor de lo que se pensaba anteriormente, y reduciría el dióxido de carbono (CO2) en la atmósfera en un 25%.

Según sus autores, se trata de la solución más efectiva para el cambio climático de que dispone el mundo en este momento.

Pero otros investigadores dicen que los resultados de la investigación son “demasiado buenos para ser verdad”.

La capacidad de los árboles para absorber el dióxido de carbono hace que sean un arma valiosa en la lucha contra el aumento de las temperaturas.

El Panel Intergubernamental sobre el Cambio Climático (IPCC, por sus siglas en inglés) dijo que si el mundo quisiera limitar el aumento a 1,5 °C para 2050, se necesitaría un millón de hectáreas adicionales de árboles.

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How Farming Can Change to Feed Us All While Saving the Planet — and No, You Absolutely Won’t Have to Become Vegan

Sir David Attenborough and most of the elite of the scientific community are now telling us that we only have 10 years to act if we are to avoid irreversible climate change. They’re also saying that farming must play a leading role in helping us achieve net zero emissions.

It’s not surprising that most farmers and landowners are asking how they should respond.

Most experts agree that the only way we can actually take CO2 out of the atmosphere is to rebuild the soil carbon that 50-plus years of continuous arable farming has removed. To do that, we need to switch to mixed farming systems that include a crop rotation with pastures grazed by cows or sheep.

The key question is how could such a switch be profitable, especially in a country whose younger generation — including our own children — is reducing its intake of red meat, believing it’s the right thing to do, both for their health and the health of the planet, in some cases going vegetarian and vegan?

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Expertos instan a integrar la agroecología con otras formas de producción

Roma, 3 jul (EFE).- La agricultura ecológica debe integrarse con otros métodos de innovación con el fin de que los sistemas alimentarios se vuelvan sostenibles, afirmaron este miércoles asesores de la ONU en un nuevo informe.

El Grupo de expertos de alto nivel del Comité de Seguridad Alimentaria Mundial (CSA), un foro intergubernamental de Naciones Unidas en el que también participan el sector privado y la sociedad civil, presentó en Roma las conclusiones de un estudio centrado en la agroecología.

En las últimas décadas ese concepto “dinámico” se ha expandido del terreno a los paisajes y a los sistemas alimentarios en general, dijo en el acto el jefe del equipo encargado del informe, Fergus Sinclair.

Entre los principios generales por los que se rige la agroecología a nivel local están el reciclaje, la reducción de insumos externos, la salud del suelo y de los animales, la diversificación económica, la gobernanza de los recursos naturales y la participación de distintos actores.

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Agroecology as Innovation

On July 3, the High Level Panel of Experts of the UN Food and Agriculture Organization (FAO) released its much-anticipated report on agroecology in Rome. The report signals the continuing shift in emphasis in the UN agency’s approach to agricultural development. As outgoing FAO Director General Jose Graziano da Silva has indicated, “We need to promote a transformative change in the way that we produce and consume food. We need to put forward sustainable food systems that offer healthy and nutritious food, and also preserve the environment. Agroecology can offer several contributions to this process.”

The commissioned report, Agroecological and other innovative approaches for sustainable agriculture and food systems that enhance food security and nutrition, two years in the making, is clear on the urgent need for change. “Food systems are at a crossroads. Profound transformation is needed,” the summary begins. It goes on to stress the importance of ecological agriculture, which supports “diversified and resilient production systems, including mixed livestock, fish, cropping and agroforestry, that preserve and enhance biodiversity, as well as the natural resource base.”

It is not surprising, of course, that those with financial interests in the current input-intensive systems are responding to growing calls for agroecology with attacks on its efficacy as a systematic approach that can sustainably feed a growing population. What is surprising is that such responses are so ill-informed about the scientific innovations agroecology offers to small-scale farmers who are being so poorly served by “green revolution” approaches.

One recent article from a researcher associated with a pro-biotechnology institute in Uganda was downright dismissive, equating agroecology with “traditional agriculture,” a step backward toward the low-productivity practices that prevail today. “The practices that agroecology promotes are not qualitatively different from those currently in widespread use among smallholder farmers in Uganda and sub-Saharan Africa more broadly,” writes Nassib Mugwanya of the Uganda Biosciences Research Center. I have come to conclude that agroecology is a dead end for Africa, for the rather obvious reason that most African agriculture already follows its principles.”

Nothing could be further from the truth. As the new expert report shows, and as countless ecological scientists around the world can attest, agroecology brings much-needed innovations to prevailing smallholder practices. With a long track record of achievements in widely varying environments, the approach has been shown to improve soil fertility, increase crop and diet diversity, raise total food productivity, improve resilience to climate change, and increase farmers’ food and income security while decreasing their dependence on costly inputs.

The failing policies of the present

The predominant input-intensive approach to agricultural development can hardly claim such successes, which is precisely why international institutions are actively seeking alternatives. The Alliance for a Green Revolution in Africa (AGRA) is the poster child for the promotion of input-intensive agriculture in Africa. At its outset 13 years ago, AGRA and its main sponsor, the Bill and Melinda Gates Foundation, set the goals of doubling the productivity and incomes of 30 million smallholder households on the continent.

There is no evidence that approach will come anywhere near meeting those worthy objectives, even with many African governments spending large portions of their agricultural budgets to subsidize the purchase of green revolution inputs of commercial seeds and synthetic fertilizers. National-level data, summarized in the conclusion to my book Eating Tomorrow, attests to this failure:

  • Smallholders mostly cannot afford the inputs, and the added production they see does not cover their costs.
  • Rural poverty has barely improved since AGRA’s launch; neither has rural food insecurity. Global Hunger Index scores remained in the “serious” to “alarming” category for 12 of the 13 AGRA countries.
  • Even in priority crops like maize and rice, few of AGRA’s 13 priority countries have seen sustained productivity increases.
  • Production increases such as for maize in Zambia have come as much from shifting land into subsidized maize production as from raising productivity from commercial seeds and fertilizers.
  • There is no evidence of improved soil fertility; in fact, many farmers have experienced a decline as monocropping and synthetic fertilizers have increased acidification and reduced much-needed organic matter.
  • Costly input subsidies have shifted land out of drought-tolerant, nutritious crops such as sorghum and millet in favor of commercial alternatives. Crop diversity and diet diversity have decreased as a result.

recent article in the journal Food Policy surveyed the evidence from seven countries with input subsidy programs and found little evidence of sustained—or sustainable—success. “The empirical record is increasingly clear that improved seed and fertilizer are not sufficient to achieve profitable, productive, and sustainable farming systems in most parts of Africa,” wrote the authors in the conclusion.

Agroecology: Solving farmers’ problems

Branding agroecology as a backward-looking, do-nothing approach to traditional agriculture is a defensive response to the failures of Green Revolution practices. In fact, agroecological sciences offer just the kinds of innovations small-scale farmers need to increase soil fertility, raise productivity, improve food and nutrition security, and build climate resilience.

Do these innovations sound backward looking to you?

  • Biological pest control: Scientist Hans Herren won a World Food Prize for halting the spread of a cassava pest in Africa by introducing a wasp that naturally controlled the infestation.
  • Push-pull technology: Using a scientifically proven mix of crops to push pests away from food crops and pull them out of the field, farmers have been able to reduce pesticide use while increasing productivity.
  • Participatory plant breeding: Agronomists work with farmers to identify the most productive and desirable seed varieties and improve them through careful seed selection and farm management. In the process, degraded local varieties can be improved or replaced with locally adapted alternatives.
  • Agro-forestry: A wide range of scientists has demonstrated the soil-building potential of incorporating trees and cover crops onto small-scale farms. Carefully selected tree varieties can fix nitrogen in the soil, reduce erosion, and give farmers a much-needed cash crop while restoring degraded land.
  • Small livestock: Reintroducing goats or other small livestock onto farms has been shown to provide farmers with a sustainable source of manure while adding needed protein to local diets. Science-driven production of compost can dramatically improve soil quality.

These innovations and many others are explored in depth in the new HLPE report, the full version of which will be available in English in mid-July. Those advocates of industrial agriculture would do well to read it closely so they can update their understanding of the sustainable innovations agroecological sciences offer to small-scale farmers, most of whom have seen no improvements in their farms, incomes, or food security using Green Revolution approaches. Many farmers have concluded that the Green Revolution, not agroecology, is a dead end for Africa.

Posted with permission from Food Tank

Regenerative Agriculture Hits the Mainstream

If you’re a cattle producer, you may already have heard the term “regenerative agriculture.” If you’re a grain producer, maybe not.

But that’s about to change. This spring, General Mills announced a plan to advance regenerative agriculture practices on one million acres of farmland in the U.S. and Canada by 2030, and Cargill Canada announced its Sustainable Canola Program.

“We have been feeding families for more than 150 years and we need a strong planet to enable us to feed families for the next 150 years,” General Mills chairman and CEO Jeff Harmening said in a press release. “We recognize that our biggest opportunity to drive positive impact for the planet we all share lies within our own supply chain, and by being a catalyst to bring people together to drive broader adoption of regenerative agriculture practices.”

The Rodale Institute in the U.S. coined the term to describe a kind of organic agriculture that not only maintains soil resources but improves them by limiting soil disturbance, maintaining soil cover, increasing biodiversity, keeping living roots in the ground and integrating animals into cropping systems.

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The Green New Deal Wants Farmers to Restore the Land, Not Keep Wrecking It

By the time California rancher Doniga Markegard picks up the phone around lunchtime, she has already moved the chickens, fed the chickens, fed the pigs, cared for a new litter of 11 piglets, moved the sheep, tended to the horses, milked the cow, and completed a business advising session about the future of her family’s 10,000-acre operation. Overall, a pretty typical Monday.

“We’re good at working with the land and working with the animals, but then all of a sudden you have to add marketing and sales and inventory management,” says Markegard. Based 50 miles south of San Francisco in Half Moon Bay, Markegard and her family produce grass-fed beef and lamb and pastured pork and chicken for customers in the Bay Area. If they operated in a more traditional way, they would specialize in a single product and plug neatly into the industrial agriculture system. Instead, in order to break even, they have to run the equivalent of a consumer-facing small business with a farm attached.

“We’d love to just be out on the land with the livestock, doing what we do, but that’s not practical when you really want to be fully regenerative,” she says.

Regenerative agriculture might sound at first like a subtle variation on organic. But if the term “organic” highlights what’s absent—no chemical fertilizers, no pesticides—”regenerative” goes a step further, advocating for practices like adaptive multi-paddock grazing, in which ruminants like cows and sheep are slowly rotated across a property, so they graze on and fertilize one section of the farm at a time while allowing the rest to naturally regrow and replenish. Methods like this require more hands-on planning involvement from the farmers, but they’ve been found to restore soil health, capture carbon, and help ranches thrive over the long term.

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