I essentially never harvest resources. In fact, I'm not sure I ever have. I harvest terrain features; marshes if I don't have the marsh pantheon, and I'll harvest forest or rainforest if I want the production boost or if I am going to improve the tile anyway, but I always leave resources intact. I know this strategy is incorrect, though; I'm too focused on the long-term value of keeping resources intact and benefiting from the better yields than the short-term benefits of harvesting that can snowball. So, my question is: when do you harvest resources? Are there certain resources you'll never/always harvests? Do you routinely harvest, or only when you're trying to rush something? Or are you like me and only ever harvest features? Also, I've read a lot recently about how powerful harvesting forests are, which isn't something I do much either. When should this be done?