The variety of mineral, organic and radioactive substances dumped into the global ecosystem through anthropogenic activity is immense. Alan gives an outline of the scale of the problem before describing sustainable approaches using plants to cleansing water and rebuilding aquatic habitats. He then discusses the impact of electro magnetic radiation on trees and methods for the alleviation of this source of stress upon them.
The Wessex Research Group archive contains those lectures that have been digitised and are freely available as a personal educational tool.
https://www.wessexresearchgroup.org