Make the most efficient use of your dishwasher’s energy and water consumption and run the dishwasher only when you have enough dirty dishes accumulated for a full load. Running your dishwasher with a full load only can prevent100 pounds of carbon pollution and save $40 on energy bills annually. Using the air-dry option, if available, helps too.
In addition, you can save water and energy by scraping dishes instead of rinsing them before loading the dishwasher. Most dishwashers today can thoroughly clean dishes that have had food scraped, rather than rinsed, off — the wash cycle and detergent take care of the rest.
More tips: http://www.epa.gov/earthday/actonclimate/