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When our Sun goes inactive
When our Sun goes inactive, with its surface temperature becoming reduced from the present 5,800 degrees to the 4000 degrees range, a 70% reduction in radiated energy would result that would be similar to what we see in the umbra of the sunspots. The reduction would make the tropics slightly colder than the regions at the 70 degree latitude presently are. Some form of outdoor agriculture would therefore likely be able to continue there, maybe with enhanced lighting. In practice a large portion of the agriculture would have to be carried out in indoor facilities with artificial environments, artificial sunlight and artificially enhanced CO2 density, and so on. This is in essence what the stars are teaching us.
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