Biodegradable, Sustainable, Renewable, Natural, Synthetic PolymersDebates and Dilemma

Because our planet is a semi-isolated system, human activity must obey numerous requirements: 1. Ore, fossil fuels, atmosphere and other physical resources have a defined potential without inlet stream. If we use these resources their potential is lowered forever. 2. Energy can be, to some extent, exchanged with space. Solar radiation brings heat by infrareds and the atmosphere controls the heat depletion by a greenhouse effect. Both phenomena maintain the average temperature at the earth's surface. 3. UV radiations are filtered by the ozone layer mitigating their harmfulness, the less so as ozone is depleted. 4. End-of-life polymer wastes pollute our environment. 5. Native pollutants are often widespread in nature but industrial and end-of-life wastes transform their nature and create more harmful polluted spots. Consequently we must think about: 1. The replacement of crude oil by renewable plants 2. The sustainability of polymer goods 3. The disposal of end-of-life wastes including biodegradation 4. The choice between natural and synthetic polymers...