responsible

US / rɪˈspɑnsəbəl/

・

UK /rɪ'spɒnsəbl/

Having an obligation to do something, or having control over or care for someone, as part of one's job or role.
Being the cause of something that has occurred
Being the primary cause of something and so able to be blamed or credited for it.
Having the duty of dealing with something
Morally accountable for one's behavior.
Able to be trusted to do what needs to be done

Examples

The organization needs to become more environmentally responsible.

All members of the Cabinet are collectively responsible for decisions taken.