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To eliminate waste without polluting, consider whether it can be recycled, reused, or donated. However, hazardous waste, such as chemicals or electronics, requires special handling and disposal to prevent it from polluting landfills. Organic waste can be composted or converted into fuel at a biogas generation facility.

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.

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.

According to the College of Agriculture and Life Sciences, there are over 10,000 kinds of mushrooms, and some are harmful to both humans and animals. However, not all mushrooms are harmful—some feed on thatch and wood, which provides nutrients for grass and plants. 

But unless you’re a mushroom expert (mycologist), it can be hard to tell poisonous mushrooms from non-poisonous. So if you have kids or pets (or both), removing them is the safest route to take.