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.

Plans to produce diesel fuel from "alien" plants growing in South Africa grabbed the attention of international delegates attending a bio-energy conference in Durban on Monday. The delegates, from 12 ...

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 ...