"我认为我们在保护环境不受污染(pollution)方面还做得不够."这句话翻译成英语是什么

I think that what we have done so far in environmental protection isn't enough.
I thought that we are not polluted in the protection environment the aspect also to do insufficiently.
I think we are not polluted environment protection is doing enough.
we have more things to improve on protecting environment to be unpolluted.
I don't think we have done much enough to protect the environment from pollution.
说法太多了,