Updated

Substitute rat's milk for cow's milk and you will help save the world. At least, that’s what Heather Mills believes.

The 39-year-old former model turned activist turned estranged wife of Paul McCartney launched a pro-vegan campaign Monday in Hyde Park, in England.

Animal charity Viva! features Mills on two huge traffic-stopping billboards and a series of ads that advocate the reduced consumption of dairy and livestock.

"The startling truth is that animals farmed for meat and dairy are now one of the greatest threats to the planet,” Mills said. The billboards, numbering near 100, will be put up all over England on Tuesday.

Click here to read the full story in the DailyMail.com

One of the ads also mentions Mills' disability. It reads, “You haven’t got a leg to stand on!” in reference to her amputated leg, which she lost in a motorcycle accident in 1993.

A second billboard has Mills in a seductive dress lying on a cracked and utterly destroyed scorching hot surface in an attempt to portray how consuming meat and dairy is contributing to global warming and destroying the earth.