Eating fish doesn't cause as much damage to the environment as eating other kinds of meat
Carnivores derive their energy and nutrient requirements from a diet consisting mainly or exclusively of animal flesh. Animals (and some plants and fungi) that depend solely on animal flesh for their nutrient requirements are called obligate carnivores while those that also consume non-animal food are called facultative carnivores.
Humans that eat meat are more typically considered omnivores, as they consume both animal and non-animal food.
Freeganism is often associated with "dumpster diving" for discarded food, and is more generally a philosophy of limited participation in the mainstream economy and minimal consumption of resources.
Freegans take an activist stance against the exploitation and waste of conventional food systems, and are typically associated with an anti-consumerist and anti-capitalist ideology and an engagement in a wider range of alternative living strategies, such as voluntary unemployment, squatting abandoned buildings, and "guerilla gardening" in unoccupied city parks.
Locavores actively encourage relationships between food producers, distributors, retailers, and consumers in a particular place, where they work together to increase food security and ensure economic, ecological and social sustainability of a community. They reject food travelling long distances to reach the consumer, and often promote sustainable and organic farming practices.
Pescetarianism is the practice of following a diet that includes fish or other seafood, but not the flesh
of other animals. Most pescetarians maintain
a lacto-ovo vegetarian diet (eating some animal products such as eggs and dairy) with the addition of fish and shellfish.
Pescatarians are typically motivated by health, ethical and environmental concerns. They often view fish as the least unethical meat source, and that the environmental impact and amount of energy needed to feed a cow, a chicken or a pig significantly exceeds its nutritional value.
Vegetarianism is the practice of not eating meat or fish. Vegetarians eat foods like vegetables, fruit, nuts, beans and grains. Some vegetarians eat or drink animal products such as milk and eggs. Vegetarians often eat tofu, falafel and other meat substitutes.
Vegetarians have different reasons for not eating meat, including that it is wrong to kill animals, bad for their health or the environment, or because their religion forbids eating animals.
Veganism is “a philosophy and way of living which seeks to exclude, as far as is possible and practicable, all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose.” (definition by UK Vegan Society)
Vegans are typically motivated by: animals and their welfare; making the world a fairer place; reducing their environmental impact; and improving their health.