Jürg Wyttenbach <ju...@datamart.ch> wrote: > Clean energy today just means: Does not produce NO2/CO2 or micro > particles. But all the resources needed for clean energy still do. > Not all of the resources, and not in equal amounts. Building a nuclear plant takes far more resources and more fossil fuel than the equivalent power in a wind turbine or solar cell, even taking into account the duty cycle. Most of the manufacturing of a solar cell can be done with electricity from another solar cell. Granted, some fossil fuel is needed for mining and material preparation.
After a nuclear plant is in place, additional fossil fuel is needed to mine and prepare uranium fuel. No fuel is needed for wind, solar or hydroelectricity. Maintenance, such as cleaning the surface of a solar cell, is done with the electric power generated by the cell. Robin <mixent...@aussiebroadband.com.au> wrote: > Go check the facts. The populations of some Western nations are actually > falling. World population will soon stabilize, and then begin to fall. That is, unless there is a sudden change in people's behavior and they start to have many more children. The worldwide fertility rate is close to replacement (2.2 children per woman). The actual number of people is still growing rapidly, which gives the impression that people are having many babies. Not so! Nearly all of this growth is from older people living longer. For the last 30 years the cohort of people from age 0 to 15 has not increased much. It is stable at 2 billion. 80 years after a first generation cohort stabilizes, that cohort dies off, so the entire population remains stable from that time on. There is some population growth in sub-saharan Africa, but I do not expect it will continue. See: https://data.worldbank.org/indicator/SP.DYN.TFRT.IN? See this video starting around minute 21, especially minute 23: https://www.youtube.com/watch?v=FACK2knC08E
