There are no sustainable energy sources/cost

About
One form of the argument that there are no sustainable energy sources focuses on the cost of sustainable energy, claiming that (for example) the total cost per unit of electricity produced by solar cells is substantially more than that from fossil-fuel power over the lifetime of the cell.

Flaws
This claim is simply wrong; investment in a solar cell system generally pays back in reduced costs after a period of several years; after that, the energy is effectively free for the remaining life of the hardware, which is generally two or three decades.

Costs are also continuing to drop dramatically due to the accelerating pace of research.