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The time it takes for leaves to decompose can range from six months to three years. Key factors influencing the decomposition rate include water, sunlight, and heat, so local weather conditions play a significant role. Decomposition will take longer for thick, matted layers of leaves. To speed up the process, you can mulch the leaves, as smaller pieces break down faster. Spreading large piles into thinner layers to increase exposure to sunlight and water also helps accelerate decomposition.

Depending on the method you choose to remove grass, it may or may not matter whether the grass is wet or dry when you perform the task. A dryer lawn will be easier to negotiate with a sod cutter, especially if you're not planning to reuse the turf. However, using a shovel by hand might be a little easier if the ground is slightly damp but not so much that it sticks to the tool.  

It’s unlikely your leaves are a hazard, especially if you get to them while they’re dry. However, a couple of rare risks exist. University studies suggest that decaying leaves can produce organochlorines, toxic pollutants similar to man-made PCBs (polychlorinated biphenyls), so avoid keeping them in an enclosed area.

Also, leaves and compost may cause the growth of fungi that can cause diseases like histoplasmosis and aspergillosis, as well as mold spores that are unhealthy for human lungs. Again, severe issues are rare, but those with compromised immune systems or allergies to mold should wear face masks when directly handling leaves.

You’ll need to kill the earwigs using traps or insecticides, and then prevent them from entering your home. Make sure you fix leaks and seal up all cracks and crevices. You can use a dehumidifier to cut the moisture and drive earwigs out.