When considering nuclear power, remember that to an extent nuclear plants are like batteries. Fossil fuels are used to mine the ore, refine it, and construct the nuclear power plant. If all the power to do so came from nuclear plants, the costs of nuclear energy would be many times higher. At those costs, many renewables are cheaper now. So, you can have liquid fuels without using fossil fuels.
Energy efficiency can do much to reduce energy demand.
Flourescent lights are improving in quality, and are much more efficient. Growth estimates cited probably assume people in developing nations adopting the worst of today's technology. Technologies are becoming more energy efficient. Look at how much more computing one can do per watt of energy. America uses twice the amount of energy per unit of industrial output than Europe or Japan, showing how much many processes can be improved.