From its desert vistas in the north to the southern region of Asir, the Kingdom is home to an abundance of vegetation, including more than 2,000 wild plant species belonging to 142 families. According to the Saudi National Center for Wildlife, however, about 600 of thee species are classified as endangered and 21 are already thought to be extinct.
The SGI, announced in March 2021, is the largest afforestation project the country has ever seen, with a target of planting 450 million trees by 2030. By the end of 2021, about 10 million trees had already been planted across all of the Kingdom’s 13 regions.
When one thinks of Saudi Arabia, forests might not be the first type of ecosystem that springs to mind. However, the Kingdom has about 2.7 million hectares of woodland, primarily in the remote southwestern highlands of Abha and Asir.
On the face of it, the goal of planting 450 million trees may sound ambitious, to say nothing of the planned greening of the desert, especially given the frenetic urban expansion the Kingdom is witnessing.
But in fact, to counter the potential harm of urban sprawl, the Saudi government has set specific SGI goals to incorporate green spaces harmoniously into urban expansion, including parkland and afforestation within the limits of the Kingdom’s desert cities.
With no rivers or natural lakes, and very little annual rainfall to replenish sources, Saudi Arabia established seawater desalination plants in its eastern and western coastal areas to support inland cities. Nevertheless, the demand for freshwater is growing and natural aquifers are fast depleting.
The Saudi government is therefore exploring ways to preserve its water resources and use them more efficiently so that they can continue to meet the demands of a growing economy while also keeping green spaces well watered.
Maria Nava, a scientific consultant for Greening Arabia at the King Abdullah University of Science and Technology Center for Desert Agriculture, told Arab News that the SGI’s strategic team is likely to tap into treated wastewater to irrigate newly planted vegetation.
Another goal, she said, is “to reduce rainfall loss to the sea or through sand infiltration by the implementation and improvement of water harvesting in the Kingdom and remediation of soil for water retention where needed.”
Plants in urban areas tend to need much more water and canopy cover to provide shade than those growing in mountain, wadi and desert climates, Nava said.
“This vegetation requires more water compared with desert trees, which are drought-resistant and have fewer leaves,” she added.
Given the Kingdom’s diverse topography, much will need to be done to restore arid or semi-arid lands, prevent soil erosion, retain water, farm using permaculture techniques, and plant vegetation that is tolerant of local conditions, including the growing threat of dust storms.
“All areas in the Kingdom are important and are treated as such,” said Nava. “Each action zone has been deeply studied and analyzed for its potential for tree growth, water availability and aftercare of the vegetation.
“Within the scope of each zone, the propositions are based on being sustainable and that the vegetation can be kept and enhanced in the future. It is not that some have more attention than others; it is more that some, because of weather, water availability, soil, topography, etc., have a higher potential to ‘host’ vegetation than others.
“Nevertheless, all ecosystem changes will affect others, which has also been considered. Each strategy has been thought out in order to be sustainable.”
Driven by necessity, Saudi Arabia is rethinking its water-conservation strategy. Given the ambitious goals of the SGI, a shift from irrigation with desalinated water to the use of treated water was recommended because of the energy demands.
“Desalination is more energy-intensive than wastewater treatment,” said Nava. “It is possible to reuse all the wastewater for irrigation since the water quality is good for it and there are already plans for this to happen in the Kingdom.
“Currently there is already some reuse of treated wastewater, and as part of the national water strategy the reuse of treated wastewater will reach 70 percent by 2030, with plans to increase this percentage in the near future.”
As the nation becomes more aware of its natural bounties, communities across the Kingdom are also beginning to more actively participate in efforts to achieve the goals of the SGI and achieve a greener future.
“The communities are the base for all the initiatives to become real and succeed,” said Nava. “It is highly important to engage and involve the people, hear their needs, understand their traditions and make them part of the decisions.
“The implementation of the SGI has to be based on three main pillars: social, economic and sustainable.”