Start with any piece of land. Like pigs, goats are very harmful to the Hawaiian environment.
Goats are famous for eating plants down to the roots, leaving nothing but dust in their wake.
This is a recipe for erosion. On Hawaii's steep slopes, cleared of vegetation by goats, there is nothing to stop the soil from simply washing away. This ensures that the native plants will not be able to recover, and also floods the reefs with choking silt. Goats are found on Kauai, Oahu, Molokai, Maui, and the Big Island. Kauai's famous Waimea Canyon, once carpeted along its steep walls with marvelous and diverse native vegetation, has been stripped bare.