Japan is one of many Asian countries, so we should contribute to the world by becoming actively involved in environmental issues.
この場合、次のような言い方ができますよ。
ーJapan is one of many Asian countries, so we should contribute to the world by becoming actively involved in environmental issues.
「日本はアジア諸国の一員なので、環境問題に積極的に関わることで世界に貢献するべきだ」
to contribute to the world「世界に貢献する」
environmental issues「環境問題」
ご参考まで！
カナダ 
