Noah did not know, that it will be burned.

The parties to the covenant must be noticed. Note how frequently the
share in it, which all living creatures have, is referred to in the
context. In verse 10 the language becomes strained (in the
original), in order to express the universal participation of all
living creatures; and in verse l3 'the earth' itself is spoken of as
one party. God recognises obligations to all living things, and even
to the dumb, non-sentient earth. He will not causelessly quench one
bright, innocent life, nor harm one clod. Surely this is, at least,
an incipient revelation of a God whose 'tender mercies are over all
his works.' He 'doth take care for oxen'; and man, with all the
creatures that are with him, and all the wild ones that 'come not
near' him, and all the solid structure of the world, are held in one
covenant of protecting and sustaining providence and power.

2. The sign of the covenant is described at great length in verses
12-17. Note that verses 12, 13 state the general idea of a token or
sign, that verses 14-16 deepen this by stating that the token to man
is a reminder to God, and that verse 17 sums up the whole with
emphatic repetition of the main points. The narrative does not
imply, as has often been supposed, that the rainbow was visible for
the first time after the deluge. To suppose that, is to read more
into the story than is there, or than common sense tolerates. If
there were showers and sunshine, there must have been rainbows. But
the fair vision strode across the sky with no articulate promise in
its loveliness, though it must always have kindled wonder, and
sometimes stirred deeper thoughts. Now, for the first time, it was
made 'a sign,' the visible pledge of God's promise.