The Dimensions of National Heritage The focus here is strictly on the natural side of the heritage coin. In discussing concepts such as natural heritage, we must never forget that we are talking about our planetary survival system, not just some artifact that we, the human species, now suddenly consider important. Furthermore, we must never forget that Canada is, by virtue of its place and history of industrial development, custodian of about 20 percent of the planet's remaining wilderness, and most of that is government or Crown land. We have a global responsibility to protect it, whether we consider it part of our natural heritage or not. It is not ours to squander.