He is an expert in oceanography.

My major is oceanography.

She decided to undergo facial reconstructive surgery.

He is dedicated to the study of organogenesis.

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

This area has a unique microclimate.

Climate change is a global issue.

He is majoring in climatology at university.

We need to break out of this vicious cycle.

The nitrogen cycle is very important for maintaining ecosystems on Earth.