"Heidegger doesn’t mean that it is sometimes edifying to put human needs and interests in perspective before affirming what is otherwise their obvious seriousness. He means that human needs and interests aren’t serious."
This short essay on Heidegger is very good: it locates his historicism - roughly, the idea that you don’t understand a time other than your own - in a kind of moral reasoning. When debating what to do with the environment, for example, the Heideggerian insight might be that the debate is already lost. We do not see the forest or the trees as someone before industrialization might. We already see them explicitly as objects for our use or our preservation. A whole world of “what Nature means” is closed to us.