Responsible
/rɪˈspɒnsɪb(ə)l/
adjective
1. having an obligation to do something, or having control over or care for someone (or something).
2. morally accountable for one's behaviour.
We have a duty to conserve the planet that has given us our own lives and offers life to future generations of plants and animals.
Think globally, act locally and daily to protect the environment in which we live.
The extinction of our species—and quite possibly, depending on the cause of the extinction, of all life—would be the end of the extraordinary story of evolution that has already led to (moderately) intelligent life, and which has given us the potential to make much greater progress still.