As humans continue to grow in population we are going to start requiring more food and room in order to sustain that population. This is becoming a harder question for humans to figure out. In order to produce more food (specifically livestock), we need to use more land in order to raise and develop them. The problem of their CO2 emissions also comes into play as they make up about 18% of greenhouse gases right now. Livestock is not as sustainable as we think it is and we will not be able to feed the estimated 9 billion people that are supposed to be on the planet by 2050.
Fish might be the answer we are looking for, more specifically wild fish. There are campaigns in place by ocean conservation organizations attempting to diversify the fish population throughout our entire ocean. We will be able to do this by implementing better fishing regulations to prevent unsustainable fishing methods such as ghost fishing.
This will help because fish provides healthy protein at a cost that is lower than beef, chicken, lamb, and pork. This will increase accessibility for those in poorer parts of the world. In addition, fish do not require arable land in order to develop and they produce little CO2 than traditional livestock. Fish could be the answer we need to ensure a sustainable living for generations to come.