humanfromearth wrote:The first one is the virtually unlimited source of energy with high efficiency that should be an easy task to produce and maintain. Solar panels are very expensive and have a low output, wind energy has a the drawback of maintenance (the rotor often breaks), undersea things same problem and geothermal energy is hard to get because earth crust is not of the same width as in iceland where a magma source is close to the surface. If a clean, efficient and cheap energy source would be available I don't see any problem in using it. Do you?
This is what I go to school for...all evidence I've come across says that it's not just possible, but probable. At the moment, the technology is at a great starting point and developing quickly. In theory, I think it could accomplish what the Venus Project founder has in mind.
Take your geothermal point, for example. The Earth's crust and thus the availability of naturally-occuring geothermal heat does vary drastically. The energy economy of Iceland is not possible in Kansas. So, spot on there, man. But, huge advances are being made in the field of enhanced geothermal systems (EGS), specifically hot dry rock technology. I won't go into detail with this, but the idea is to create artifically appropriate geothermal sites, rather than being dependent on naturally occuring sites. This allows a massive portion of the Earth's geology to be utilized for geothermal (within environmental reason, of course). The tech to do this is well understood...test facilities have already been built, and more are on the way.
Similar advancements are being made in other renewable energy areas. Solar panel costs are plummetting, vast strides are being made in wind tech, and tidal/wave generation systems are starting to come online, with vast potential.
We just need the drive and determiniation to completely revolutionize our energy infrastructure (and the rest of society, ideally). Technologically, nothing's stopping us.