Svalinn the shield, perhaps the ozone-layer, which protects Mother Earth, Fjörgyn, her soil and waters, from sun’s burning rays.

Veit ek að hauður og haf munu upp brenna falli Svalinn frá
I know that land and seas will burn up if Svalinn falls off.

Svalinn (the “cooler”) is the shield protecting mother Earth from sun’s rays.
Útgarðar can be outer atmosphere – Þór is son of Earth – our brother and protector.

We shall love our Mother Earth with all our heart.
Treat her gently.

Hávamál:  Take no more than modestly needed;
þurra skíða og næfra kunni maður mjöt.

Same Svalinn on Youtube