I think the best response is to live simply and close to the land. As far as food is concerned, the
100 mile diet is a good solution. Humans have survived for thousands of years without all of our 'necessary' conveniences such as A/C, central heat, fresh strawberies in January, and insanely cheap energy, and we can survive without it if we pay attention to what we are doing. Treat it like an adventure or a game. Ask yourself how you can live more sustainably, where you could get fresh water if the tap was shut off, how you could get by without a car, or where you could get a meal from if the stores were closed (or priced out of reach).