My understanding--and this is subject to the fact that I'm neither a lawyer nor an environmental lawyer--is that this particular phraseology is standard language. It, or something close to it, can be found in the Canadian Environmental Protection Act and in many provincial statutes. There is nothing exceptional about it.
Evidence of meeting #34 for Environment and Sustainable Development in the 39th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was amendment.
A recording is available from Parliament.