Colony collapse was due to fungicides being sprayed in the day. -Bees don't need extra pollen (they have plenty of food to spare which is why we have honey as a product), and they don't need people's lawns (pick the leaves up before winter).
Leaving leaves is just being an asshole neighbor making safe paths for vermin to get into houses, and reduce the value of neighboring properties.
A testament to how hardy fish are. If you have fish dying in an aquarium; you shouldn't have pets.