Also, we are more aware that even protein sources used in many popular brands of pet food may come from animal waste, not fit for human consumption. (petslady.com)
While some acidification is caused by factory and vehicle emissions, the major fault lies with high ammonia levels in animal waste generated by the country's cattle industry. (newscientist.com)
If you depend on wood and animal waste for energy, there will be no economic development. (educationworld.com)