The world is on fire! None of our efforts in software development will matter at all if we don't change the course of the climate crisis. The software lifecycle also causes direct and indirect CO2 emissions: It leaves a footprint and exacerbates environmental problems. However, the environmental aspect is not the only one we need to focus on. If we take our responsibility seriously, we must consider software development holistically, in the sense of the so-called triple bottom line, from all three sustainability perspectives: social, economic, and ecological. Sustainability is, on the one hand, a necessity in the current crisis and, on the other hand, increasingly a key factor that determines the success of companies both in the search for talent and for customers and markets.