CAPE TOWN (Reuters) - In South Africa's Franschhoek mountains a helicopter drops off abseilers to cut down invasive pine trees that are choking off water supplies to millions of Cape Town residents ...

Water-greedy alien trees – especially pine, eucalyptus and wattles – are among the biggest threats to South Africa’s precarious water future. Infecting them with insects or diseases from their home ...

It is a very strange island far out in the Arabian Sea, off the coast of Yemen, and is often referred to as the most alien-looking place on earth. This has been accumulated on Socotra, one of a group ...