What significance is there in talking to the land and the sky?
אבר מן החי על בראשית א:א
בראשית: אם מבלבלים את האותיות, מקבלים ברית אש. זו התורה, שנאמר, מימנו אש דת למו (דברים לג:ב). ואז הפסוק נקראית: ברית אש ברא א-לוקים את השמים ואת הארץ. שנאמר, האזינו השמים ואדברה, ותשמע הארץ אמרי פי (דברים לב:א).
Ever Min Hechai on Bereishit 1:1
Breishit: If you rearrange the letters, it becomes "a covenant of fire (Brit Aish)". [What is the covenant of fire?] It is the Torah, as it says: "From his right, the fire of law for him (Deuteronomy 33:2)." And so the verse reads, "A covenant of fire did G-d create with the heavens and the earth," like it says, "Hear, O heavens, and I shall speak; let the earth hear the sayings of my mouth (Deuteronomy 32:1)."
We see that the earth and sky are witnesses, or even participants, in the covenant of the Torah. Let's move on.
I just wanted to share an insight from Rabi U'Mori, Rabbi Menachem Liebtag. Rabbi Liebtag pointed out that birds of prey, like an eagle, learn to fly by sink or swim. This means that mother eagles drop their young, and the little ones learn to fly by necessity.
Rabbi Liebtag re-interpreted the above verse, and particularly the words Yifrosh K'nafav. According to his idea, this actually refers to the baby eagle, spreading his wings and needing to be taken by the parent if he falls. This is a metaphor for Am Yisrael, who try to folllow mitzvot but sometimes fall. They need Hashem to help them, to lift them on his wings. This is especially appropriate in the lead-up to Rosh Hashanah.
Hashem also uses this reason to hold back from punishment elswhere.
This is something amazing to think about. We are an Or Goyim, a light unto the nations, and when Hashem punishes us he suffers too.
G-d's representatives in the physical world are us. It is up to us to make sure that set a good example, and show how kind Hashem can be to his faithful.