NSW greens and environment groups are calling on the Berejiklian government to look into environmental consultants profiting off conservation offset programs.

It comes after an investigation by the Guardian revealed that an environmental consultant holding interests in a property made more than 40 million dollars selling conservation offsets to governments.

The same consultants are reported to be a part of a consortium that has made tens of millions of dollars profiting from the scheme that was set up to protect and restore endangered habitat elsewhere.