KEY Exam 3 Essays (33 points)
Important note 1:
For those of you who missed multiple choice #15, shame on you for
floods and droughts
are strictly natural disasters!!! As we’ve been learning,
are human-activated problems
Important note 2:
For MC #22, I will give credit for letter d, 2000, as well as for 1000,
since the book used 1500 as the number of pesticide-resistant species.
1. What are 6 things you could do personally to contribute to more efficient water
use? (3 points)
Most everyone got full credit for this.
Some said baths are better than showers, some said showers save water over baths. Ha!
That will depend on the way you shower. I didn’t take off points, but please read below:
showers vs baths
: You know that calculations on water use are based on
certain average or general parameters. But you can use common sense. If you want to be
in the water a long time, take a bath instead of a long shower. However, a “quick” shower
will use less water than filling an average tub.
According to several studies,
automatic dishwashers save water over hand-washing
dishes. That would depend on how you do both. Dishwashers also can be set on the
water-saver cycle, and they should be fully loaded. Skip the heat-dry cycle, and of course,
you should use
. There are other considerations beside water use,
such as resources and energy used to manufacture the appliance. But there are energy-
efficient appliances, eco-conscious manufacturers, resource exchange, and recycling.
Some people hand-wash dishes rather mindlessly, letting hot water run down the drain,
over one dish or spoon at a time… When you do wash dishes by hand, place cleaned,
soapy dishes in a basin or plastic tub, and catch the water and as they’re rinsed. Use cold
water for rinsing. Then re-use the water.
Lazy People Can Save the Planet
Use the dishwasher if you want to save water, U.K. study concludes
“…a study by U.K. nonprofit Waterwise found that the average dishwasher uses between
3 and 4.5 gallons of water per load, while hand dishwashing can use over 16 gallons…
…If U.K. dishwasher ownership rose to 40 percent, says the study, the country would
save up to 20 million gallons of water every day.”
Here’s the link: