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Most people would agree that invasive plants are unwanted.

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In South Africa, a water-scarce country, groundwater is a vital supply for small towns and commercial farming.

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Climate change is underway, and human activities such as urbanisation, industrialisation and food production are key contributors. Food production alone accounts for around 25% of global carbon emissions. Ironically, the changing weather patterns and more frequent extreme weather events resulting from climate change also put the world’s food supplies at risk.

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South Africa’s worsening water crisis is no longer just about taps running dry; it is now directly linked to growing fears of food insecurity.

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Water has ranked in the top five risks for seven consecutive years in the World Economic Forum’s Global Risk Report. And if you look at the headline threats to humanity  and the planet over the next decade, as pinpointed by 1,000 experts, all but one are linked to water.

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When you think of a country’s water resources, you may not realise that there are many kinds. Some is surface water, such as dams and rivers. There’s also groundwater, which includes aquifers and, in some places, artificial recharge schemes that transfer surface water below-ground to store it.