Ребят, проверьте сочинение на ошибки)
I think that preservation of life on our planet is essentially important. Without it, we won't be able to exist. Life is a major concept of our existence. But life is not eternal definition.
Technical progress gradually reduces some animal species, birds, plants and fishes. However scientists work on development of more eco-friendly enterprises, treatment plants and filters. It slows down process of extinction live a little.
In my opinion, our planet will shortly spend all the natural stocks. Population will increase to global scales. Scientists won't be able to prevent this process, but can slow down it. Also huge works on stay or creation of ways to increase Earth life time are now conducted.
But all this will only delay death of the native planet. Sooner or later we should replace habitat

Fishes! Слово "рыбы" в англ имеют такую же форму, как в ед.ч. , то есть fish и, возможно,   preservation of life можно заменить на life preservation.