Clearing water-guzzling and soil-damaging alien invasive plants costs South Africa several hundred million rands every year.

The spread of species beyond their native habitat is a human-made environmental change on a global scale. Among vascular plants, over 16,000 species have now permanently settled in foreign countries.

Erik Irmer has been documenting the spread of invasive plant and animal species that disrupt native ecology across Europe. He focuses on humans’ interactions with these plants and animals. Aliens is p ...

Clearing water-guzzling and soil-damaging alien invasive plants costs South Africa several hundred million rands every year. Now, a promising pilot project to recoup some of this cost by producing ...