Article copied work for work from April 1990 Issue of High Times Magazine pages 37-41 and page 57. "OUR CHALLENGE TO THE WORLD: TRY TO PROVE US WRONG-- If all fossil fuels and their derivatives (coal, oil, natural gas, synthetic fibers and petrochemicals) as well as the deforestation of trees for paper and agriculture (e.g., Brazilian & Indonesian rainforests), are banned from use in order to save the planet, preserve the ozone layer and reverse the greenhouse effect with its global warming trend: Then there is only one known renewable nat ....