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The Conversation
The Conversation
Environment
Alanna Rebelo, Senior Researcher, Agricultural Research Council

Removing alien plants can save water: we measured how much

Alien trees threaten biodiversity, increase the risk of wildfires and also guzzle water. Photo courtesy Cape Winelands Biosphere Reserve

Humans’ relationship with nature is broken. We’re transforming the Earth so dramatically that almost one million plant and animals species face extinction. Losing species unravels the tapestry of nature, changing how ecosystems function and, ultimately, damaging society too.

Nature brings huge benefits to people. Some are tangible. In South Africa alone, the value of these benefits to people is estimated at R275 billion annually (about 7% of the country’s gross domestic product). That value includes providing the country with crops, wood, water and fuel. There are other, less immediately tangible benefits, too: air purification, water regulation, water purification, recreation, tourism, and cultural and heritage value.

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