Cellulase is one important enzyme which is widely used in energy, food, textile and paper making. It has significant meaning to solve the problem of energy crisis, food crisis and sustainable human development. In order to find out the perfect high-yield cellulase strains, the screening of solid environmental samples such as soil, humus, feces and the yeast of distiller, liquids environmental samples such as hot springs and polar oceans, organism samples such as insects, animals, plant tissue and fungus, were reviewed in this paper. And most of...
