[Judgie]

David, you're going to want a lot of solar panels, and pumps with a very high power/energy consumption ratio, considering you'll be pumping water from ground level up to 30 floors vertical or higher. Then again, if the greenies revoke their anti-nuclear ways, you might get away with it.

[nocar]

Yes, it is obviously possible to have indoor greenhouses if you have energy to waste. But then, if you have energy to waste, transporting food from the country to the cities is no problem.

Some Swedish researchers have done calculations regarding greenhouse gases. Taking tomatoes as an example, less CO2 is emitted if Swedes buy them from Spain in winter than from the Netherlands. The Spanish tomatoes grow unheated and with natural light which more than makes up for the longer transport. As for buying Swedish-grown tomatoes in winter, they just do not exist. No one can grow tomatoes in winter and make a profit given the very weak light and the cold weather in Sweden - even though Sweden has inexpensive electricity, compared to most European countries.

These researchers advice Swedes to eat carrots (harvested in the fall then kept in storage) instead of tomatoes in winter.

Summer is different.

nocar