He removed unnecessary items from the room.

They are my best friends.

Chemical pollution has a serious impact on the health of the Earth.

Marine pollution is a global issue, and all countries should cooperate to find a solution.

Genetic contamination may have serious impacts on biodiversity in the natural world.

This area is affected by multiple contamination.

We should seriously address the issue of water pollution.

We should recycle to prevent environmental pollution.

Thermal pollution can potentially have serious effects on marine life.

This area is affected by background pollution.