Quotes by Ecological To be economical agriculture must be ecological. Charles Walters ecological agriculture Ecological differentiation is the necessary condition for coexistence. Garrett Hardin ecological ecology differentiation In the global marketplace of the future the price of every product will tell the ecological truth. Kalle Lasn ecological marketplace products The Industrial Age is not sustainable. Its not sustainable in ecological terms, and its not sustainable in human terms. Peter Senge ecological term age Birds are an ecological litmus paper. Roger Tory Peterson ecological paper bird When you don't take into account the way ecological systems work, then you do damage. Vandana Shiva ecological damage way Ecological thought rejects consumerism at its peril. Timothy Morton thought ecological consumerism peril Inevitably, ecological awareness has this kind of '70s flavour to it. Timothy Morton inevitably ecological awareness kind