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From spirulina to soy, chia seeds and squash, alternatives to meat are popular because they offer a new way to fill up on protein. But if you’ve decided to choose these options to reduce the environmental impact of your diet, bear in mind that eating too much of these foods might not be so wise either. In fact, it could contribute to nitrogen pollution. We get protein from rib-eye, but also from fried eggs, a bowl of lentils or a salad of beansprouts. Protein is an essential part of our diet, helping the body to build muscle tissue and to renew cells in bones, hair and nails. Whether of animal…