Please use the inversion of subjunctive mood to help me modify this sentence to make it conform to English grammar
were you had done this, the environment of us would be destroyed

Question

Answer

Had you done this our environment would have been (OR would be) destroyed now.

This is probably How I would have written or said it.

I hope thats helpful.

Answer

Were you to do this, the environment would be destroyed.
However, it might sound more natural if you said: 
"If you were to do this,..."