This paper gives methods of determining the optimum vacuum of condenser that takes account of the save on cooling water, the methods can help reduce costs and environ.

They then calculated the eutrophication potential of each food group and compared these farm-to-table nitrogen footprints to carbon footprints, using data from a well-known 2008 study Environ. Sci.

Here, we use "service" in the broad sense of providing something that might be both material (such as shelter, power, and hardware) and immaterial (such as a runtime environ-ment).