This paper identifies some energy and environmental options for the future in Australia. Some possible growth patterns for both conventional energies and the renewable energies over the next decade are described using a modified S-curve (logistic curve) linked to the Volterra-Lotka equations of competition. Particular attention is paid to the production of CO2. The final conclusions suggest that some radical rethinking in the energy mix may be required, and that contrary to current official scenarios, there could be a significant increase in the use of natural gas and the renewables.