When my coworkers see news like this they start telling me that I ought to bring my fleet of Nubian goats out on jobs like this. They do great work, easily digesting poison ivy (and destroying its seeds so it can't regrow from their droppings).
Goats are a big component of a project I'm working on now, where they will graze on fallow land, eating weeds and grasses, depositing fertilizer and tilling the land with their hooves in the process.
In a small farming operation where the negatives to using many chemicals (to fertilize crops, and to kill weeds) isn't even always safety or environmental, but simply cost-related: the work that grazing animals like goats can provide is a game-changer. Plus, they are super fun animals to be around. I used to think that having a few backyard chickens for eggs would always be a no-brainer decision, but now I am sure that I'll always keep a couple goats around too.