Please, look at the bolded which it is in the following passage. I don't think it is a relative pronoun, but I can't find which used as a conjunction in a number of dictionaries. How is which used in the sentence? I'm sorry I couldn't find the source of this passage.
Whenever our urge is to fight a specific biological change, we should ask the following triplet of questions. Will our efforts have made much difference a few hundred years hence? If not, this means we are fighting a battle we will inevitably lose. Next, will our great-grandchildren’s great-grandchildren be that bothered if the state of the world has been altered, given that they will not know exactly how it is today? If the answer to this second question is no, this means we are fighting battles we do not need to win. If change is inevitable, which it is, we should then ask a third question: how can we maximize the benefits that our descendants derive from the natural world? In other words, how can we promote changes that might be favourable to the future human condition, as well as avoid the losses of species that might be important in unknown ways in future?