More than 530,000 people have signed a pledge to go meat-free for at least one day every week.
The pledge was created by global activism group Avaaz, which sent an email asking people to eat less meat, to its 46 million members.
The organization, which uses the digital space for campaigning, is best known for its petitions.
According to the email: "56 billion animals are crammed into filthy, windowless cages and slaughtered every year to feed our meat addiction.
"It’s truly horrible, and it may take years to shut down these factory farms, but there's one thing we can all do today that could accelerate their end: eat less meat.
"Avaaz is 46-million-strong and global. If we each pledge to go meat-free just one day a week, even if we are already vegetarian or vegan, then invite our friends, celebrities and companies to join, we could help build the largest global pledge ever!
"Let's send a signal to industrial meat producers that the tide is turning."
Members are asked to sign a pledge which says: "As a citizen concerned about animal welfare, climate change, and biodiversity, I pledge to eat less meat (or no meat at all!), and encourage workplaces, schools, supermarkets, and restaurants to join in helping spread this critical culture change more widely.
"This will help animals, the planet, and my health, and contribute to keeping our world sustainable for future generations."