Mike Grunwald, a journalist and author of "We Are Eating the Earth," dives into the complexities of feeding a growing global population while tackling climate change. He discusses the challenges of industrial agriculture, like fertilizer overuse and environmental harm. Grunwald argues for increasing calorie production per acre to sustain 9.8 billion people by 2050. He explores potential solutions, including biofertilizers and cultivated meat, while emphasizing that vertical farming may not be practical due to high electricity needs.