Why is nobody building greenhouse towers?
>build towers that produce ethanol
>cheap, clean, reliable energy for everyone
Seems quite simple, why is there no serious approach for it?
I have found in the internet that a square meter of greenhouse costs around 20 dollars. Lets say building it in a tower structure is significantly more expensive, so lets say 50 dollars. that puts the square kilometre price at 50.000 US-$. So building 1 million square kilometres of ethanol producing greenhouse costs only 50 billion. 1 km2 allows for around 500.000 litres of ethanol production per year, so we are speaking about 500 billion litres a year. lets say the towers have an operating time of 20 years before they need full replacement. then you could generate 10 trillion litres for the price of 50 billion US-$, or 0,05 cents per litre. That does not include operating cost yet. Lets assume those are very high and say they are 10 cents per litre. Thats still just 10,05 cents per litre of ethanol. A barrel would cost around 16 US-$. So even if we double all the cost we would still end up with 32 US-$, which is still significantly under oil prices.
So why isnt it happening?