3. His list, in descending order of importance, was: energy, water, food, environment, poverty, terrorism and war, disease, education, democracy, and population.
A. His list contains ten items: energy, water, food, environment, poverty, terrorism and war, disease, education, democracy, and population. They are arranged in such a way that each item is more important than one that follows it.
B. The ten items on his list----energy, water, food, environment, poverty, terrorism and war, disease, education, democracy, and population----are gradually losing importance now.