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You are alone in that whatever happens to your planet is your responsibility, whether you choose to accept this or not.
I am from a star system in the galaxy nearest to yours: Andromeda, also known as M31, which, according to the human concept of time, would take you 2 million light years to reach. Obviously we, not so limited, have a different mode of travel which includes moving backward, as well as forward, in "time." Therefore we have seen your past, and we have seen your future, and it is the latter which prompts us to send our message to you.
Understand this: species come and go, and it is of no consequence to us, or to the cosmos, that you humans exist or do not exist. It is the health of your exquisite planet that concerns us, nothing more.