So is not being able to travel away from out of control forrest fires,tornadoes,etc,etc,etc.
Not to mention not having anything to eat because there is no ability to plant crops,tend them,harvest them,and get them to a market too far away for you to walk to buy them.
Hell,unless it rains,there won't even be any water to drink unless they live close to a large fresh water lake,and chances are that even if they do,it won't take long for the influx of thirsty city refugees ruins the water by using it for a toilet.
Then there is no cars to drive or even bicycles to ride to shop because no rubber tires will be made,no fuel will be made to be pumped,etc,etc,etc.
The ONLY way to cure the brain farts these idiots keep coming up with is to round the bastards up and drop them off on a deserted island somewhere in the Pacific,and let them see how well they can live without fossil fuels.
MY prediction is "Give them just ONE week,and they will be killing and eating each other.