In answer to the question I would say reducing the amount of persistent man-made chemicals we produce and disperse.

Recent evidence has indicated that the man-made chemicals have played an important role in creating the seasonal ozone hole over the South polar region.

They are important in the production of many man-made chemicals such as pharmaceuticals and plastics.

Part of the good ozone layer is gone - destroyed by man-made chemicals.

He promotes a position of "skepticism" towards claims that man-made chemicals cause cancer in humans.

Long Island's 10,000-year-old glacial melt water does not contain man-made chemicals.

Fertilizers, if used at all, are now more commonly supplied by compost, rather than man-made chemicals.

The term "organic" can be broadly described as food grown without the assistance of man-made chemicals (businesssweek.com).

But what about patients who are apparently fit and healthy until they suffer a massive exposure to toxic man-made chemicals?

Sensitivity to man-made chemicals also seems to be part of the picture.