In his book "Eating Animals," Jonathan Safran Foer emphasizes the contradiction between consuming factory-farmed animal products and claiming to be an environmentalist. He argues that the environmental impact of industrial animal agriculture is significant, and engaging in such practices undermines the integrity of one's commitment to environmentalism.

Foer highlights the need for individuals to reconcile their dietary choices with their environmental values. He suggests that true environmental advocates must re-evaluate their consumption of animal products and consider more sustainable alternatives to align their actions with their beliefs.