Why do environmentalists such as Paul Ehrlich view unchecked population growth as a problem?
What will be an ideal response?
Environmentalists recognize that much of Earth's natural capital cannot be effectively replaced. Land area is one of these. We cannot expand Earth, increasing its surface area to accommodate an unlimited population. Overpopulation also leads to degradation of natural systems and loss of biodiversity. We cannot always devise a substitute for lost ecosystem services and cannot replicate the exact function of missing species in ecosystems. Lost species may perform vital ecosystem services such as pollination, and they may also have educational, aesthetic, or medicinal value that is irreplaceable. While Ehrlich's predictions of the 1960s have not fully materialized in the 2000s, the fact remains that many ecosystem services are in a state of decline, and despite the view of some Cornucopian economists that we can safely ignore his warnings, the pressure of a growing global population on essential resources and biodiversity remains unmistakable.
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The number of stars in the Milky Way galaxy is about
A) 25 million. B) 100 million. C) 100 billion. D) 25 trillion.
Marine mammals use echolocation to detect objects. For echolocation to work, marine mammals must be able to ________.
A. generate rapidly produced clicks of short duration B. screen out unrelated loud noises in the sea C. detect faint echoes as their clicks reflect back from objects D. evaluate the time and direction of return sounds E. All of these are correct.
?A late loss population (K-selected species) is exemplified by species such as elephants and rhinoceroses.
Answer the following statement true (T) or false (F)
A wave crest may change orientation in map view in a process known as ____________________
Fill in the blank(s) with correct word