英语帮下忙谢谢

once/if I‘ve reached a stage where salvaging is impossble
where salvaging is impossible - 无法挽救的地步

we can't stand by and do nothing -我们不能袖手旁观
when it comes to environment issue which is of important value

1 Once I went to the point where nothing can save the point where

2 for the interests of the serious environmental problem we can not stand

1/While the earth environmental damage reach to a certain extent, which will not be able to fix up.
2/We cannot remain aloof from those important environmental issues that have grown worse.