"Our" planet is a globe and finite. It will never grow.
This Earth will always be the only place for us to live.
Other planets are too far away, out of reach.
Life depends on material resources and energy. All life forms are interdependent: animals, plants, insects, microbes.
Human life depends on its balance within its environment.
"We" are responsible for our actions and our inaction.
Though God may exist, we still have to do "it" ourselves, here and now, be and act responsibly, whilst we are alive.
The "Golden Rule" applies to all people of all creeds:
Do not do onto others what you don't want to be done onto yourself.
striving for the highest possible scientific validity.