Pssst ~ those aren't the only 2 scenarios. HTH...

What?

Your statement is illogical

Not really, I live in a zone 2/3 climate. The only way to have tomatoes, the actual plant in question grow successfully is to start them in February or possibly even earlier. Shaving time off how long they're in a heated greenhouse will correspond with a reduction of greenhouse gases. However that reduction would come due the use of GMO'd tomatoes.

Does anyone care now that there are seedless water melons?

WAIT WHAT?! Where have I been? Where do I get some?

Solar power your greenhouse, mofo.

But don't you want to have the sunlight hitting your greenhouse instead of the panels? I was under the assumption that having a greenhouse in the colder zones was to warm the internal ambient temp. and avoid dormancy. I'm not trying to be snarky i just dont have experience growing in colder climates.

Do you know how many hours of sunlight and how weak it is in a zone 2/3 in Feb? You would be hard pressed to keep the lights on the extra 4 or 5 hours you need let alone heat it from -25 C in Feb unless your pannnels covered a whole lot of ground. :)

Yeah, and did you know there are seedless grapes too?

It is a good question. I our area we have thousands of acres of greenhouses growing peppers, tomatoes and cukes. All heated by natural gas and with supplemental lighting. There is no way one could generate enough solar energy to power these plant factories. The other day I asked a trucker what he transported. Tomatoes from Southern Ontario to California he said. Okay what did he pick up in California. Tomatoes to transport back to Ontario.

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They constantly try to escape from the darkness outside and within
Dreaming of systems so perfect that no one will need to be good T.S. Eliot

Solar @ 52* N latitude from November til March is a bit of a challenge here. Also, before you say wind - when the temps drop past -25*C the wind usually disappears.

Other question is how much fuel is saved from using roundup ready crops. Farmers do one spray application and no cultivation until after harvest.

How much fuel is saved with higher yields? How much more biofuel can be produced with higher yields? Is the Big4 going to demand their current line of cars burn only non-GMO ethanol? I really doubt that.