Fertilizers can put extra nitrogen into coastal waters, which can cause
a) overgrowth of algae that produce toxins b)too many fish which depletes oxygen c)the water to become too salty d) a change in the water's temperature

Why the moon is not visible from earth during the new moon ?

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

What does the kyoto protocol aim to reduce