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

His actions exerted a great influence on our plans.

His opinion had a big influence on my decision.

That news greatly influenced his opinion.

This problem is very serious.

Do you understand the seriousness of this problem?

He is very healthy because he exercises every day.

Health is more important than anything else.

Earth is one of the planets in the solar system.

He is majoring in chemistry at university.