No successes we might have are guaranteed to last as long as industrial civilization stands. Conversely, most of our losses are effectively permanent. Extinct species cannot be resurrected. Overdrawn aquifers or clear-cut forests will not return to their original states on timescales meaningful to humans. The destruction of land-based cultures, and the deliberate impoverishment of much of humanity, results in major loss and long-­term social trauma. With sufficient action, it's possible to solve many of the problems we face, but if that action doesn't materialize in time, the effects are irreversible.