It means that the toxic effect on the river would be unpredictable, as the way combinations of toxic waste affect the environment is not studied enough.

The fish is even more dangerous for people than toxic water.

There is inconsistency in the information about the toxic waste.

It is contaminated with human and animal waste. But there isn't this sort of toxic soup out there,

I look up at the painting. It's not even that interesting. Definitely doesn't grab me and shake my brain around like the meadow scene did.

We're bringing in addition reconnaissance means and others, and I think we are having an effect, ... As I said in Washington a couple of days ago, we're winning, Milosevic is losing, and he knows it.