Question

landfills do have some disadvantages. which of the following is a disadvantage of landfills? they produce no foul smells and are usually visually appealing. they can be used forever as the trash breaks down quickly. methane, carbon dioxide, and leachate pollution can occur. they are cheap to build and are very easy to maintain indefinitely.

Explanation:

Landfills can generate methane (a potent greenhouse - gas), carbon dioxide, and leachate which can contaminate soil and water. The other options are incorrect as landfills often produce foul smells, trash doesn't break down quickly, and they are not inexpensive or easy to maintain indefinitely.

Answer:

Methane, carbon dioxide, and leachate pollution can occur.