3 ms·The sun delivers several orders of magnitude more energy and is free...by busterarm 6y agoThe sun delivers several orders of magnitude more energy and is free...monadic3 6y agoNot inside it doesn't. This understanding is quite clear in my comment. Greenhouses can only grow so far vertically without increasing energy costs.monadic3 6y agoAlso, I'm really curious what you're comparing sun to.... the sun itself?