If you woke up tomorrow as the last living human on earth - everyone just up and vanishes - how long do you think you could survive off of scavenged stuff (food, fuel, etc) before you have to settle down somewhere and grow stuff?

How long would you have power? How long can you store gas/diesel before it becomes totally unusable? How do you grow stuff when a lot of modern crops are bred to be sterile?

How big of a problem would the sudden, sharp rise in animal populations worldwide be for you?

How long before you kill yourself?