We are searching for extraterrestrial life.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Earth science is an important field of study for unraveling the mysteries of nature.

The air in this area is greatly affected by pollutants emitted from factories.

This polluted water could potentially harm our health.

Soil pollution in this area has become serious due to years of industrial activity.

Air pollution is having a serious impact on the health of the planet.

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

We should seriously address the issue of water pollution.

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