I am a bit perplexed that it seems most AIs will NEVER learn sanitation to get rid of jungles, even though they have numerous resources hidden in jungles in their cities. I think the AI should weight learning bronzeworking/sanitation stronger than typicial if they have resources that cannot be utilized before learning those techs. Getting bronzeworking to gain access to silk (for non-elven folks) seems like a no-brainer to me, since the temporary delay (assuming another tech is desired asap) will pay for itself over time.
After all, if you had a city with 2 ancient temples, 2 gems, and bananas, all in jungles, wouldn't you consider making Sanitation a fairly early tech to get? Also, when the AI civ finally does get sanitation (as evidenced via trade or them finally working a tile), they invariably ONLY remove jungles with resources. I would think the AI would want to put some tile improvement on every workable tile, and if necessary build enough workers to do so.
After all, if you had a city with 2 ancient temples, 2 gems, and bananas, all in jungles, wouldn't you consider making Sanitation a fairly early tech to get? Also, when the AI civ finally does get sanitation (as evidenced via trade or them finally working a tile), they invariably ONLY remove jungles with resources. I would think the AI would want to put some tile improvement on every workable tile, and if necessary build enough workers to do so.