Passive indicators of environmental degradation: The news they tell us is bad. Besides suffering from natural calamities (both drought, and floods when augmented by anthropogenic erosion and siltation), a number of species in North America have become endangered, or been driven to extinction due to the fourfold attack of pollution, siltation due to agricultural runoff, river impoundment, and invasive exotic species. The Unionidae were among the first victims of widespread pollution. For example, in 1922 it was observed that the mussel fauna in the Big Vermillion River had been completely destroyed for a distance of 14 miles below the sewage outfall of Urbana, Illinois (Parmalee, 1967).
Sylvia Plath 's most famous book of poetry is called Ariel . It is named so because she considered the poem to be the best in the book. Many readers know that the title of the poem was changed to "The Horse" for the less discerning newspaper readers and think the poem Ariel is simply about her riding a wild horse. Others, however, such as Nick Mount on YouTube , consider Plath's earlier childhood fascination with The Tempest's character Ariel and view the poem as talking about creativity and the dangerous direction her creativity was taking her.