The environmental instruments to environmental measuring will be analyzed and questioned. An absence of biological instruments will be indicated and the controversial discussion between the economy and biology is also approached. The economy as dominant science has developed instruments that will be accepted as universal languages. On the other hand the biological factors and the environmental services will be transformed in money, which may be a danger for the environmental preservation. The second part of the article is focused on the instruments developed for measuring the worth of forest. / Se presentan y discuten los instrumentos ambientales que nos permiten llevar a cifras y valorizarlos servicios ecosistémicos. En tal sentido se plantea la falta de instrumentos desarrollados desde las ciencias naturales. Se llama la atención en este vacío y cuestiona la validez de los instrumentos meramente económicos. En la segunda parte el artículo se centra en los instrumentos desarrollados para la medición del valor de los bosques.

Lynn Riggs was an early to mid-20th century Native American playwright who wrote twenty-four full length plays, his sole enduring success being Green Grow the Lilacs, the play upon which the musical Oklahoma! is based. For much of the early part of Riggs’s career, he was considered a uniquely pioneering and promising playwright, cited in competition with Eugene O’Neill as vying for the position of best playwright of their age. But while O’Neill has gone on to be considered America’s Greatest Playwright, the life and works of Lynn Riggs, save for his contribution to Rodgers and Hammerstein, have gone largely forgotten and unexamined. It is the purpose of my paper to 1) provide a biographical sketch of the man, 2) give an overview of several major themes that run through his work, and 3) provide some theory and analysis as to why the promise of this young and distinctly Native American voice was never adequately fulfilled in his lifetime. I will attempt to argue that a combination of circumstances including Riggs’s poor home life, his at times misogynistic and racist points of view, America’s inability to see Native Americans as other than caricatures and, quite simply, bad luck put much of Riggs’s writing on a fast track to failure and contemporary obscurity.