This is a recent and huge change in the context in which we live. It demands a re-evaluation of how we operate. The Earth is no longer robust to our activities. Compared to us, the rest of the ecosystem gets more fragile by the day. Humans must learn how not to expand for the foreseeable future. We will not be doing significant space travel for a very long time so we have to make the most of Planet A – which luckily is still wonderful.