1080, the brand name given to the synthetic form of sodium fluoroacetate, is used in New Zealand in efforts to control populations of possums, rats, stoat, and rabbits, which are invasive species in the New Zealand environment. Although the Parliamentary Commissioner for the Environment deemed the use of 1080 in New Zealand "effective and safe" in a 2011 re-evaluation and the substance is widely considered to be the most effective tool currently available for controlling possums over large areas, it remains a contentious issue, with the majority of the debate occurring between conservationists and livestock farmers on one side and hunters and animal-rights activists on the other. Concerns are also raised about the security of potable water supplies in areas where 1080 is applied.