Is it possible to speculate that in the past fog could have stopped or even destroyed vegetation, with the disruption of light getting to vegetation could have been the cause of mass extinction-level events on vegetation, Let speculate for a minute. What if we had no access to sunlight for more than a year? what would that do to the crops worldwide? Are we touching on more than we can speculate right now? I could visit this more at a later date. Like, there are areas we could dive into and speculate deeper here and broaden the effects fog would have on vegetation if fog lingered more then a few hours.
