For the short term, properly storing tomatoes can increase their longevity. Although a bowl on the counter is fine for a few days, many people swear by specialized bags made expressly for the purpose of keeping fruits and veggies fresher, longer. Plus, the bags are reusable, so they're both Earth- and wallet-friendly!
If your weather forecast shows an imminent dip in the temps, it's possible to protect your green tomatoes and turn them red in the process. All you have to do is pick and wrap each tomato individually in newspaper, tissue paper or an ordinary brown paper sack to keep them from touching. Then store them in a location that steadily stays around 55 to 60 degrees Fahrenheit (12.7 to 15.5 degrees Celsius). Keep a close eye on the tomatoes by checking every few days to make they're not becoming overly ripe. Once they're nice and red, either eat or freeze them for future use.