Plant power.

Cites an article by Klaus Thews from `Stern' of Hamburg, presenting the fourth in a series of articles on projects to protect the environment, focusing on plants which could become the stars of a new energy age. Biomass or plant matter a significant source of energy; Danes pioneered this concept; East-Asian plant with unique growth rate with possible use of raw material for paper production or replacement for coal; Questions scientists must address; Skeptical environmentalists; More.