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Light is not a problem. Low humidity, weather, pests and lack of nutrients are.
Greenhouses produce way more than open fields, mainly because they allow farmers to control conditions. The glass inevitably takes away some of the light, but that doesn't matter - even at 52 degrees north.
In order to block 1% of the light reaching the Earth the screen needs to be bigger than Texas. That may be prohibitive.
It is easier to reflect the light on Earth itself. Paint everything white.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 12-11-2020 at 07:22 PM..
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