Eco friendly artists try to make a small impact on the world, but they can make a large impact on people. If they manage to gain a following, they can show others how to live in harmony with mother nature through the power of example. This is not as easy as it sounds. Many artists go without food and suffer for their art. A lucky artist may make other people suffer for his craft. The reasons for this do not matter much. The true painter, regardless of the type of pictures he chooses to make knows that he needs to use biodegradable materials. Canvas art fulfills this role. It also has a long tradition in the art world.
The canvas does not have to be made from an animal, if the person using it is conscientious about animal rights as well, but cow skin does hold up slightly better. It is also easier to manufacture. Everyone involved in the arts wants to achieve greatness and touch immortality but not everyone can do it. Even those who can pull it off, still need to worry about the legacy that they leave behind. A canvas painting fades eventually, but it will last for many years if preserved properly.