Through learning to take care of earth.
Nurturing the land, waters, creatures of earth, skies and seas. And taking care of ourselves. Limiting our birth rates, growing our own foods. Centralized communities. Etc.
Peace on earth
Live as though you're a steward of others, and earth and as if The creator would be glad of the love you give even to those who harm you.
Do good to those who harm you. And
Love your neighbor as yourself!
In this way we might have peace on earth.