20For the creation was subjected to frustration, not by its own choice, but by the will of the one who subjected it, in hope 21that the creation itself will be liberated from its bondage to decay and brought into the glorious freedom of the children of God.
I personally believe that this passage of Scripture is talking about Jesus after the resurrection, because He didn't immediately make all things right with the Creation after His resurrection, and as the next 3 chapters bare out He didn't immediately make all things right with Israel. But He subjected us all in hope to the Gospel when He said to go into all of the world and preach the Gospel to every single creature. (I guess all married creatures would be included too.) Those that believe are liberated from their bondage to decay and brought into the glorious freedom of the children of God, while those that don't believe aren't immediately enjoying the benefit of His redemptive work but continue in their subjection to frustration, according to, while at the same time not by their choice, 'cause who with a sound mind ever wishes such evils upon themselves as befall the unbeliever in this life. But the whole creation groans and travails, in the next verse, which evidently means that they're all still called according to His purposes even if they don't love God yet, as the next 3 chapters in Romans explain. Nothing can ever separate a single one, or a married one, of God's creatures from His love in Christ Jesus our Lord, and the God of peace will crush Satan under the feet of every creature very soon, whether human, animal, or other.
The creation itself will be liberated from its bondage to decay and brought into the glorious freedom of the children of God. The New Jerusalem will have no need of the sun, but that doesn't mean the sun won't exist 'cause it's a part of the beauty of God's Creation and it's one of the hymn singers of the heavens that delights in His praise. All of life [on earth] will simply be God-powered rather than Solar-powered as we have at present with how plants feed themselves and all of the other phenomenon of nature works out in our daily lives. The plants won't need the processes of the sun upon the wind and upon the sea for the plants to receive their dew, but the Presence of God in fullness will quench the thirst of every plant and of every other form of life on earth, just as it currently is that way in heaven. Outside of the New Jerusalem, whose gates aren't ever locked, are still at that time some forms of life that the Spirit and the Bride will have to say to them "Come and take of the water of life freely!" They've been subjected to futility, but they will leave their bondage to decay and enter into the liberties of the children of God 'cause that's the hope of Christ; the joy that was set before Him through which He endured the Cross, despising it's accompanying shame, and has sat down at the right hand of God expecting (i.e. in hope...) as the last Adam.