Option 1, The Water (Cess) Act, 1977, deals with the levying and collection of cess on water consumed by persons operating and carrying on certain types of industrial activities, and is clearly related to the environment.

Option 2, The Forest (Conservation) Act, 1980, provides for the conservation of forests and for matters connected therewith or ancillary or incidental thereto. This law is also related to the environment.

Option 3, The Public Liability Insurance Act, 1991, provides for public liability insurance for the purpose of providing immediate relief to persons affected by accidents occurring while handling any hazardous substance. While it may have some minor implications for the environment, its main focus is not on environmental protection, making it the correct answer.

Option 4, The Port Laws Amendment Act, 1997, amends laws relating to Ports, and while it may have implications for the environment, the legislation`s primary focus is not environmental protection. However, it still has more connection to environmental protection than option 3, thus making option 3 the correct answer.