“For God did not send his Son into the world to condemn the world, but that the world should be saved through him.”
Humanity was lost in sin and condemned because of rebellion against God. There was no hope for man. God’s sending of the Son was a rescue mission. Salvation is the giving of eternal life, v. 16.
The earth will perish. God’s people work to save the world — in this sense, humanity. Few will choose to be saved. But we proclaim the Good News to all and God will choose whom he will.