Speaking during an interview with CNN, following the release of the UN's landmark report saying we have just 12 years to stave off a climate crisis, Cameron spoke about how animal agriculture is harmful to the environment - and what people can do to reduce their own impact.
"The handwriting is on the wall," said Cameron, who was accompanied by wife Suzy Amis Cameron. "The daunting thing is the average person just shuts down, they go into denial, thinking 'well, what can I do about it as an individual'?"
Vegan and plant-based diet
"[Animal agriculture] is the second largest sector for greenhouse gas emissions next to electrical generation. And it puts it in front of all of transportation combined - so all ships, all planes, all automobiles.
"So while it's wonderful to buy an electric car, you're only attacking a smaller part of the problem. Changing our diet and nutrition is something we can do instantaneously if we choose to do it.
"So it's the quickest way we have for grabbing the thermostat of the planet and turning it down. All it takes is the will, the desire, to do it."
CNN interviews James Cameron and Suzy Amis Cameron.Subscribe to PBN's YouTube Channel here
Damage of animal ag
"If you've got biodiversity loss, deforestation, ocean acidification, dead zones, climate change, glaciers melting, you can connect the dots from all of those environmental issues back to animal agriculture," added Suzy Amis Cameron.
"It sounds crazy but it's true," said James Cameron. "They are cutting down rainforests in Brazil to make cropland to grow feed for animals and it's ridiculously inefficient compared to humans just eating plants directly."
Suzy added that not everyone can afford solar power or other attempts to mitigate climate change, but everyone has to eat. "It's a simple, elegant solution to climate change - and your health as well."
You can watch the full interview here