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Half moons allow water to be retained for agriculture and even replenish the groundwater table.

When the Great Green Wall initiative began in 2007, it was just a vision of a big, beautiful wall of greenery spanning the width of Africa to keep the Sahara Desert from encroaching on the rest of the continent. Despite years of successes and failures, celebration and criticism, we can see the progress being made as an inspiring example of how local and global collaboration can help counter the effects of climate change.

Just a few years ago, the Sahel region at the northern edge of Senegal was a "barren wasteland" where nothing had grown for 40 years. But the United Nations World Food Programme (WFP) and local villagers teamed up to regreen the area, bringing back agriculture, improving the economy of the people who live there, and preventing the climate migration that desertification ultimately leads to.

climate change, desertification, dry, global warming, barren A barren desert.Canva Photos

How do you hold back the world's largest hot desert?

According to Andrew Millison, a permaculture designer and instructor at Oregon State University, the Sahara desert has expanded by about 10% in the past 100 years. The idea behind the Great Green Wall is to build a barrier of vegetation to stop that expansion, which threatens the ecosystems and economies of the Sahel—the region south of the Sahara that separates the desert from the savanna.

In a video from February of 2024, Millison shared the collaborative nature and progress of one Great Green Wall project in Senegal, including the rejuvenation of 300,000 hectares (about the equivalent of 600,000 football fields) of seemingly unusable land.

- YouTube youtu.be

"The process started with the community-based participatory planning," WFP program policy officer Bakalilou Diaby shares in the video. "By the end of this process, it was agreed that one of the major actions is the land reclamation or land recovery project."

At first, it took some time to convince the community that the regreening of the degraded landscape was even possible, but after learning about how to improve the land, "the people believe and they are convinced, and they are also committed," says Diaby.

The "forgotten" half-moon method of harvesting water

One of the keys to this particular regreening project is using long-forgotten techniques for harvesting water. When soil is crusted and sunbaked and hard as cement, rainwater doesn't penetrate and it's impossible for plants to take root. The solution? Half-moon shaped ditches dug in such a way that water flows into them on the straight side with an embankment built on the rounded side to hold the water in. Each half moon is four meters in diameter and takes about a day for one person to dig.

Local vegetation domesticated on the Sahel thousands of years ago, such as sorghum and millet, are planted in these half moons, rehabilitating the land and feeding the local community at the same time.

"This is nothing new—we have not invented a technology here," explains Sebastian Muller from the WFP resilience team. "The half moon technology is actually an endogenous technology to the Sahel and has been forgotten over time. We have rescued it from the past."

Not only does capturing water in the half moons help with the immediate need to grow food and contribute to the Great Green Wall, but 10%—15% of the water will actually soak into the ground to replenish the water table, creating a more sustainable agricultural process.

"That way we actually achieve a balance of water. So we are not depleting the water resources, but we're making sure that we keep enough water in the ground for future generations," says Muller.

Other crops such as okra and tomatoes are grown in horizontal horticulture beds, and between those ditches grow trenches with fruit trees in them.

fruit trees, sustainable farming, agriculture, horticulture, regreening, climate change Fruit trees.Canva Photos

Engaging indigenous wisdom for sustainable farming

"This is just a very first step in this pilot," adds Muller. "We'll also be using other native species that will be planting in the pits that will drive the rejuvenation of the soil and the protection of the soil as the system starts growing into abundance and producing food and life for the people here."

According to Muller, the "syntropic farming" methods being employed were developed in Brazil and are based on global indigenous practices that mimic the way natural forests grow and thrive. These natural growing dynamics make agriculture more sustainable, continually replenishing the land rather than continually depleting it—truly a testament to global collaboration carried out at the local level with local community support.

"This project was really, really interesting because the World Food Programme wanted to demonstrate how you could take the most devastated areas and turn them back into resilient, food-producing locations," says Millison. "And they specifically placed their project on a very degraded landscape that had been taken down to bare, compacted earth."

If this desertified "wasteland" can be rejuvenated so successfully, it provides hope for recovering other land that many people might write off as useless or barren. As climate change continues to alter the Earth's landscape—literally—we'll need to keep working together both locally and globally to find solutions like the Great Green Wall and support their implementation.

You can learn more about successful permaculture practices on Andrew Millison's YouTube channel.

This article originally appeared in January.

Half moons allow water to be retained for agriculture and even replenish the groundwater table.

When the Great Green Wall initiative began in 2007, it was just a vision of a big, beautiful wall of greenery spanning the width of Africa to keep the Sahara Desert from encroaching on the rest of the continent. Despite years of successes and failures, celebration and criticism, we can see the progress being made as an inspiring example of how local and global collaboration can help counter the effects of climate change.

Just a few years ago, the Sahel region at the northern edge of Senegal was a "barren wasteland" where nothing had grown for 40 years. But the United Nations World Food Programme (WFP) and local villagers teamed up to regreen the area, bringing back agriculture, improving the economy of the people who live there, and preventing the climate migration that desertification ultimately leads to.

How do you hold back the world's largest hot desert?

According to Andrew Millison, a permaculture designer and instructor at Oregon State University, the Sahara desert has expanded by about 10% in the past 100 years. The idea behind the Great Green Wall is to build a barrier of vegetation to stop that expansion, which threatens the ecosystems and economies of the Sahel—the region south of the Sahara that separates the desert from the savanna.

In a video from February of 2024, Millison shared the collaborative nature and progress of one Great Green Wall project in Senegal, including the rejuvenation of 300,000 hectares (about the equivalent of 600,000 football fields) of seemingly unusable land.

- YouTubewww.youtube.com

"The process started with the community-based participatory planning," WFP program policy officer Bakalilou Diaby shares in the video. "By the end of this process, it was agreed that one of the major action is the land reclamation or land recovery project."

At first, it took some time to convince the community that the regreening of the degraded landscape was even possible, but after learning about how to improve the land, "the people believe and they are convinced, and they are also committed," says Diaby.

The 'forgotten' half-moon method of harvesting water

One of the keys to this particular regreening project is using long-forgotten techniques for harvesting water. When soil is crusted and sunbaked and hard as cement, rainwater doesn't penetrate and it's impossible for plants to take root. The solution? Half-moon shaped ditches dug in such a way that water flows into them on the straight side with an embankment built on the rounded side to hold the water in. Each half moon is 4 meters in diameter and takes about a day for one person to dig.

Local vegetation domesticated on the Sahel thousands of years ago, such as sorghum and millet, are planted in these half moons, rehabilitating the land and feeding the local community at the same time.

"This is nothing new—we have not invented a technology here," explains Sebastian Muller from the WFP resilience team. "The half moon technology is actually an endogenous technology to the Sahel and has been forgotten over time. We have rescued it from the past."

Not only does capturing water in the half moons help with the immediate need to grow food and contribute to the Great Green Wall, but 10% to 15% of the water will actually soak into the ground to replenish the water table, creating a more sustainable agricultural process.

"That way we actually achieve a balance of water. So we are not depleting the water resources, but we're making sure that we keep enough water in the ground for future generations," says Muller.

Other crops such as okra and tomatoes are grown in horizontal horticulture beds, and between those ditches grow trenches with fruit trees in them.

Engaging indigenous wisdom for sustainable farming

"This is just a very first step in this pilot," adds Muller. "We'll also be using other native species that will be planting in the pits that will drive the rejuvenation of the soil and the protection of the soil as the system starts growing into abundance and producing food and life for the people here."

According to Muller, the "syntropic farming" methods being employed were developed in Brazil and are based on global indigenous practices that mimic the way natural forests grow and thrive. These natural growing dynamics make agriculture more sustainable, continually replenishing the land rather than continually depleting it—truly a testament to global collaboration carried out at the local level with local community support.

"This project was really, really interesting because the World Food Programme wanted to demonstrate how you could take the most devastated areas and turn them back into resilient, food-producing locations," says Millison. "And they specifically placed their project on a very degraded landscape that had been taken down to bare, compacted earth."

If this desertified "wasteland" can be rejuvenated so successfully, it provides hope for recovering other land that many people might write off as useless or barren. As climate change continues to alter the Earth's landscape—literally—we'll need to keep working together both locally and globally to find solutions like the Great Green Wall and support their implementation.

You can learn more about successful permaculture practices on Andrew Millison's YouTube channel.

This article originally appeared in January.

All images provided by CARE & Cargill

The impact of the CARE and Cargill partnership goes beyond empowering cocoa farmers

True

Cocoa, the key ingredient found in your favorite chocolate bar, has been a highly revered food product throughout human history. It’s been used for religious ceremonies in Peru, royal feasts in England and France, traded as currency for the ancient Mayans. And considering that many of us enjoy chocolate on a regular basis (mochas and candy bars, anyone?) it seems like that love is still going strong even today.

And if you are someone who looks forward to that sweet chocolate pick-me-up on a regular basis, you likely have the women of West Africa to thank.

Women like Barbara Sika Larweh, a mother of six who works as a cocoa farmer in Larwehkrom, a community located within the Sefwi Wiawso Municipality in the Western North Region of Ghana.

care, cargillMama Cash now empowers other women to gain independence

Nearly 60% of the world’s cocoa comes from both Ghana and Côte d’Ivoire, where Barbara and other mothers make up over half of the labor force. These female cocoa farmers shoulder the same physical burden as their male counterparts—all while also running households and paying for their children to go to school. And yet, they typically don’t receive equal income. Nor do they have access to the resources that could help them achieve financial independence.

Thankfully, positive changes are taking place. Barbara’s story exemplifies the impact of programs offered by CARE and Cargill, such as Village Savings and Loan Association (VSLA), which are small groups that offer low-interest loans to individuals living in poverty, helping them to build savings without going into devastating debt.

Through these initiatives, women, like Barbara, are equipped with vital knowledge like financial literacy to improve household incomes, sustainable agriculture practices that improve yields, and nutrition education to diversify their family’s diets.

“They came and trained me on the VSLA. I dedicated myself and volunteered so that I would be able to train my people, too,” Barbara explains.

Within the first year of using the programs, Barbara and the people she trained profited—earning her the nickname of “Mama Cash.”

This is no isolated event. In cocoa-growing communities supported by CARE and Cargill programming between 2019-2022, the number of households living below the national poverty line decreased by nearly 32% in Cote d’Ivoire and Ghana - as a direct result of increasing and diversifying income through using these programs.

Like Barbara, who today is an executive member of the Community Development Committee, more than 2.4 million women have used their success as entrepreneurs to transform into leaders and decision-makers within their communities. Whether it’s giving most of their earnings back to their families, reducing child labor, or exponentially increasing overall farm yields, the rippling effect is profound.

The impact of the CARE and Cargill partnership goes beyond empowering cocoa farmers. The joint initiatives have fostered progress on complex global issues related to social justice, such as gender equality, climate change, and food security. By improving access to quality nutrition, water, and hygiene, the joint programs have positively influenced the cocoa communities’ well-being.

Suddenly there’s a lot more to think about the next time you eat a candy bar.

Find out more about the important partnership between CARE and Cargill here.
Science

Video shows African Union's vision to plant a 5,000-mile 'green wall' across the continent

The Great Green Wall will protect millions of people from the devastating effects of climate change.

A map of the Great Green Wall of Africa project

A new video by Our Eden traces the timeline of one of the most ambitious environmental projects in world history, the Great Green Wall in Africa. Eleven countries from the African Union have come together to build a 5,000-mile wall across the entire width of the continent made from trees and grass by 2030.

The project aims to prevent the entire Sahara Desert from moving southward into the Sahel region, which is home to over 100 million people and growing. The problem is climate change is causing the Sahara to expand into the Sahel at a breakneck pace of up to 30 miles every year.


The encroachment of the desert into the Sahel creates persistent droughts that destroy farms and livelihoods at a time when the population could expand to 330 million people by 2050.

So how is the project going? By 2020 it had raised $1 billion of its $30 billion price tag, and only 4% had been planted. It will have to proceed 20 times faster, restoring an additional 20 million acres per year, to finish by 2030. However, over the past two years, there has been a significant cash injection into the project of $20 billion from international organizations in a final push to finish the project by 2030.

When completed, the Great Green Wall should restore 247 million acres of land, sequester 250 million tons of CO2 and create 10 million jobs. To follow the project's progress or to donate to the cause, you can learn more at Tree Aid.