Before revision: The principles cover such concepts as: the design of processes to maximize e the amount of raw material that ends up in the product; the use of renewable material feedstocks and energy sources; the use of safe, environmentally benign substances, including solvents, whenever possible; the design of energy efficient processes; avoiding the production of waste, which is viewed as the ideal form of waste management.
After revision: Th principles cover such concepts as: the design of processes to maximize e the amount of raw material that ends up in the product; the use of renewable material feedstocks and energy sources; the use of safe, environmentally benign substances, including solvents, whenever possible; the design of energy efficient processes; avoiding the production of waste, which is viewed as the ideal form of waste management.