7.Which of the following is the best example of a sustainability effort?

	a.	A hospital and health care system creating an ad campaign that educates people on the dangers of recreational drug use
	b.	A paper mill redesigning the mill to use less water and lower the amount of emissions it releases into the environment
	c.	A department store operating a clothing drive to gather gently used winter coats for people in need
	d.	A refrigerator manufacturer supplying new refrigerators to Habitat for Humanity