Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Wastewater runoff from a golf-course irrigation system is threatening research at caves along South Africa's southern coast that contain the earliest evidence of humans exploiting marine resources, scientists say.