Re: There still remains......
@tfb - ok - here's some math
According to one source, 173 terawatts of semi-usable and otherwise unusable energy strikes the sunny side of the earth continuously. Only a fraction of this can be practically turned into electricity, when you consider solar panel efficiency, infrastructure, cabling, conversion and transmission losses, and unpredictable weather. And we can't cover every square meter with solar panels, so most will be unavailable for use. So we're limited by the flux (energy per square meter), and the ability of our tech to turn that into electricity [when the weather is nice].
It takes about 30-50kwh of energy (let's say) to charge a typical electric car daily to support average commutes (let's say an hour each way) in California, based on claims of battery capacity and range and some ballpark atmospheric extrapolation.
A solar panel that is one square meter (on a good day, at a good time) could produce 200W (and in 8 hours, 1.6kwh). Angle of the sun and day/night limits this effective time period.
with 10 million commuters in California, for 300 million kwh, you would need at LEAST 200 million square meters of panel if you get 8 hours of usable sun each day (or equivalent). More than likely you'll need at least TWICE that and some means of backup power for extended bad weather.
For a single family house, it would mean 20-40 square meters of panels per car JUST to power the cars, assuming good weather all of the time and hyper-efficient storage to handle the peak demand of having your car plugged in every day. That's a lot of panels for one house, bad weather notwithstanding. Apartment buldings with multiple floors would be even LESS practical.
Many places (mountains, lakes, forests, roads, agriculture areas, etc.) could NEVER have solar panels on them. Power loss in conversion and transmission forces you to have the generators reasonably close to the point of demand.
In short, claiming that the sun shines 10,000 times the energy needed by human electrical demand onto the planet is EXTREMELY short sighted and does NOT take into consideration what it would require to harness it (nor the efficiency). You just can't put solar panels EVERYWHERE and expect it to work. It's just not practical. [I used to run a nuclear reactor on a submarine, including the electrical power plant, and worked in the power industry for a while, so I have a pretty good idea about a lot of this].
My conclusion: there is NOT enough energy being produced by the sun in order to meet the demands of human electrical power, if you include all of the cars and our needs (and desires) for transportation, and factor in the needs to convert, transmit, and store this power to meet demand.
Hence, we need to use Nuclear, Fusion, or even fossil fuels until we have a technology that's better than what's available now. Keep in mind, with fast-charge high capacity batteries (which we do not have yet) and some form of nuclear power (which is being resisted on every level from what I see) to charge them, electric cars make sense. Without all that, they do not.
(I really didn't want to get this wordy, but it looks like I had to)