Lentils, much like most legumes, have a neat trick up their sleeve. They partner with root bacteria to capture nitrogen from the air and stash it underground. This not only gives the legumes a nutrient boost but also helps the soil retain more water and essential nutrients for the next crop. Plus, it reduces the need for those carbon-heavy nitrogen fertilizers.

When it comes to meat production, it operates quite differently from legumes like lentils. Meat production primarily relies on the consumption of feed by animals, such as cows, pigs, or chickens. These animals don't have the nitrogen-fixing capabilities found in legumes. Instead, they require protein-rich diets, often in the form of soybean meal or other crops.

The issue arises because these animals, during digestion, release a significant amount of nitrogen into the environment in the form of ammonia and other nitrogen compounds. This process is known as nitrogen excretion. Unlike legumes, which enrich the soil with nitrogen, meat production can lead to nitrogen pollution when excess nitrogen is not properly managed. This pollution can harm water quality and contribute to greenhouse gas emissions, making it less environmentally sustainable compared to legume cultivation.