Heather Mills at a charity campaign at Speakers Corner in London, Monday, Nov. 19, 2007. [Agencies]

Heather Mills got steamed up over milk and other dairy products while her estranged husband, Paul McCartney, joined a more modest effort to save a local post office.

Mills focused on the environmental impact of deforestation and livestock on global warming, citing figures from animal rights group Vegetarians International Voice for Animals (Viva!).

"When (Viva!) told me it was 18 percent, that's more than all global transport, I was in shock. Airplanes only bring 3 percent, while they are being picked on with taxes," she said Monday.

Mills, 39, asked people to "cut down on one or two meat and dairy and fish dishes a week."

"We are the only species that drinks another person's milk, so why aren't we drinking rat's milk, or dog's milk, or cat's milk, that's how crazy it is," she said.

"It's mad that we are having cow's milk. Even cows don't drink it after one year but we continue forever."