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The great green wall: can it stop the desert in its tracks? 12/3/2021
The ‘great green wall’ is an ambitious tree-planting programme that aims to rope in the cooperation of 20 different countries, from Senegal in the west, to Sudan and Eritrea in the east, to throw a wall of green in its path, and arrest the desert’s spread.To get more news about rope mesh green wall, you can visit mesh-fabrics.com official website.

The buffering wall should stabilise soils and keep them moist, it should slow the drying and scouring effects of the wind, and help restore the micro-climate, allowing food crops to grow around the trees. The UN Convention to Combat Desertification says the goal is to restore 100 million hectares of degraded land by 2030, and mop 250 million tons of carbon from the atmosphere, while creating at least 350,000 rural jobs.

But what will the direct impact of this wall of green be on the rainfall patterns of the monsoon in West Africa? And is there some way of knowing where best to position the trees, for the wall to be most effective?

These questions were central to a new piece of research by Côte d’Ivoire meteorologist and climate scientist Dr Bamba Adama, at the Université Félix Houphouët Boigny in Abidjan, who recently completed the first modelling analysis of its kind for the region. His findings could help policymakers be more strategic in how they roll out the tree planting efforts on the western-most starting point of the anticipated 8000 km-long buffer.

According to Adama, most of the current deforestation that threatens countries like Guinea and Côte d’Ivoire is happening at between 4 to 8 degrees latitude.

For the purposes of his modelling, he wanted to see where the most effective placement of a buffering green wall should be on this part of the continent, and see if the modelling could show a possible impact this might have on rainfall and temperature.

‘I ran two options through the computer model: a wall of trees that is 25 km wide, at the line of latitude in the 10 degrees north, and again at 15 degrees north,’ he explains. ‘But I specifically looked at the impact of these trees during the monsoon season, which in this region happens between the summer months of June to late August.’

Uncertainty and variability in the annual monsoon are linked with droughts, famine, and extreme flooding in West Africa, and there seems to have been an increase in extreme drought and rain events in the 1970s and 1980s, according to Adama and his research team with the Future Climate for Africa (FCFA) project.

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