BOB EDWARDS / SCIENCE PHOTO LIBRARY BOB EDWARDS / SCIENCE PHOTO LIBRARY
Pollution monitoring. Scientist takes a sample from the shore of a lake in order to monitor possible pollution by sludges containing heavy metals. Heavy metals can be toxic if consumed in large doses over a period of time. Photograph of Dr David Santillo, a Greenpeace researcher, working in Gujarat, India.
Model release not available. Property release not required.