I have to admit, this one made me think to the point of looking up cement garbage cans. Seems a bit over the top for even the strongest of doggy droppings, but then maybe there are some aesthetic as well as practical reasons for concrete garbage cans. After a short cruise on the info highway, voila, enlightenment by Barbara Mariani of Waste Management World. Think on that one, won't you???
"The use of cement has significantly contributed to worldwide economies. In fact, cement is considered to be the second most-consumed substance in our society, and the amount used in construction is more than double the total of all other building materials, including wood, steel, plastic and aluminium.
Nowadays, environmental responsibilities are high on the cement industry’s agenda because the cement manufacturing process requires extremely high temperatures which consume about ten times more energy than the average amount required by other manufacturing processes. The average amount of energy required to produce one tonne of cement is equivalent to the combustion of approximately 120 kg of coal.
Employing waste as alternative fuel has greatly helped the cement industry to manage its environmental impact. Today, many plants derive up to 70% of their energy from alternative fuels. In the past, cement companies have traditionally burned coal, petroleum coke and other fossil fuels in cement kilns, but many of them have turned to alternative fuels which substitute approximately 3 million tonnes of coal every year."
