There are a number of options for growing food inside which can be considered. There are even companies that set up indoor farms for restaurants such as Farmshelf. There are various options you can explore in the world of hydroponics and vertical farms. So there are alternatives for those caught up in global cooling. It is not all doom and gloom. The technology is there and we simply need to plan ahead. As usual, these sorts of ideas will become popular only when it turns very cold