In general, this is where the network comes in because we don't know everything. We can't engineer everything, so what you want to do is leave a network of natural areas alone so that nature, Mother Earth, is really the one that works out which species are going to thrive and which ones are really not suited to these new conditions, and whatever. So even if humans are not managing anything, we have to have enough space and connectivity in place to let nature do her thing.
Where we're managing it, of course, then, the values get laden in and we can decide, for example, whether we want to trade off three species of little arable weeds, plants, for some enhanced crop productivity through certain pesticide use. We do that all the time. It's about values. That's why the landscape effect or plan is really important, so that we leave enough space for Mother Nature to do her thing.