Did Noah preach against false teachers?

How bad was man if God had to destroy the earth the first time? And will do the same again.

How bad was man if God had to destroy the earth the first time?

Pretty bad.
Gen 6:5 The LORD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.

In the story of Noah, after the Flood God specifically tells Noah that he will not destroy mankind again for its sinfulness by flooding the earth.

However, at the end of the ages, this present Creation will pass away. It will not be destroyed, but renewed. And, as far as I can see in the Scriptures, it will not be destroyed *specifically *because of man’s wickedness, but because God’s plan has been completed and it will be the consumation of all things:

From 2 Peter 3:
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Know this first of all, that in the last days scoffers will come (to) scoff, living according to their own desires
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and saying, “Where is the promise of his coming? From the time when our ancestors fell asleep, everything has remained as it was from the beginning of creation.”
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They deliberately ignore the fact that the heavens existed of old and earth was formed out of water and through water by the word of God;
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through these the world that then existed was destroyed, deluged with water.
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The present heavens and earth have been reserved by the same word for fire, kept for the day of judgment and of destruction of the godless.
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But do not ignore this one fact, beloved, that with the Lord one day is like a thousand years and a thousand years like one day.
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The Lord does not delay his promise, as some regard “delay,” but he is patient with you, not wishing that any should perish but that all should come to repentance.
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But the day of the Lord will come like a thief, and then the heavens will pass away with a mighty roar and the elements will be dissolved by fire, and the earth and everything done on it will be found out.
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Since everything is to be dissolved in this way, what sort of persons ought (you) to be, conducting yourselves in holiness and devotion,
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waiting for and hastening the coming of the day of God, because of which the heavens will be dissolved in flames and the elements melted by fire.
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But according to his promise we await new heavens and a new earth in which righteousness dwells.
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Therefore, beloved, since you await these things, be eager to be found without spot or blemish before him, at peace.

From Revelation 21:
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Then I saw a new heaven and a new earth. The former heaven and the former earth had passed away, and the sea was no more.
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I also saw the holy city, a new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.
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I heard a loud voice from the throne saying, “Behold, God’s dwelling is with the human race. He will dwell with them and they will be his people and God himself will always be with them (as their God).
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He will wipe every tear from their eyes, and there shall be no more death or mourning, wailing or pain, (for) the old order has passed away.”
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The one who sat on the throne said, “Behold, I make all things new.” Then he said, “Write these words down, for they are trustworthy and true.”
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He said to me, “They are accomplished. I (am) the Alpha and the Omega, the beginning and the end. To the thirsty I will give a gift from the spring of life-giving water.
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The victor will inherit these gifts, and I shall be his God, and he will be my son.
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But as for cowards, the unfaithful, the depraved, murderers, the unchaste, sorcerers, idol-worshipers, and deceivers of every sort, their lot is in the burning pool of fire and sulfur, which is the second death.”

Finally, from the Catechism of the Catholic Church:

THE HOPE OF THE NEW HEAVEN AND THE NEW EARTH

1042 At the end of time, the Kingdom of God will come in its fullness. After the universal judgment, the righteous will reign for ever with Christ, glorified in body and soul. The universe itself will be renewed:

The Church . . . will receive her perfection only in the glory of heaven, when will come the time of the renewal of all things. At that time, together with the human race, the universe itself, which is so closely related to man and which attains its destiny through him, will be perfectly re-established in Christ.

**1043 **Sacred Scripture calls this mysterious renewal, which will transform humanity and the world, “new heavens and a new earth.” It will be the definitive realization of God’s plan to bring under a single head “all things in [Christ], things in heaven and things on earth.”

**1046 For the cosmos, Revelation affirms the profound common destiny of the material world and man:

For the creation waits with eager longing for the revealing of the sons of God . . . in hope because the creation itself will be set free from its bondage to decay. . . . We know that the whole creation has been groaning in travail together until now; and not only the creation, but we ourselves, who have the first fruits of the Spirit, groan inwardly as we wait for adoption as sons, the redemption of our bodies.**

1047 The visible universe, then, is itself destined to be transformed, “so that the world itself, restored to its original state, facing no further obstacles, should be at the service of the just,” sharing their glorification in the risen Jesus Christ.

1048 “We know neither the moment of the consummation of the earth and of man, nor the way in which the universe will be transformed. The form of this world, distorted by sin, is passing away, and we are taught that God is preparing a new dwelling and a new earth in which righteousness dwells, in which happiness will fill and surpass all the desires of peace arising in the hearts of men.”

True and subsistent life consists in this: the Father, through the Son and in the Holy Spirit, pouring out his heavenly gifts on all things without exception. Thanks to his mercy, we too, men that we are, have received the inalienable promise of eternal life.

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