Bay area Air Quality (Spare the air )

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Sixth Mass Extinction:  The Holocene Extinction

The Holocene extinction is the extinction of species during the present Holocene epoch (since around 10,000 BC).  The extinction includes families of plants and animals including mammals, birds, amphibians, reptiles and arthropods.  The International Union for Conservation of Nature and Natural Resources has recorded 875 extinctions occurring since 1500 but the vast majority of extinctions are …

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Third Mass Extinction:  Permian-Triassic Extinction Event

 The Permian-Triassic extinction event occurred 251 million years ago. This is the worst recorded extinction period, also known as the Great Dying.  During this period, 96% of all marine species and 70% of all terrestrial vertebrate species became extinct.   All types of life forms were affected including marine life, plants and terrestrial invertebrates and vertebrates.  Due …

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Second Mass Extinction: Late Devonian Extinction Event

The Late Devonian extinction event occurred around 375 to 360 million years ago.  During this mass extinction 19% of all families, 50% of all genera, and 70% of all species went extinct.  At this time, there were two major continents Euramerica and Gondwana that started to merge to create the supercontinent Pangea.  This extinction event …

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WWF v. WWF (World Wildlife Fund v. World Wrestling Federation)

The acronym WWF was shared by both World Wide Fund for nature and World Wrestling Federation since 1979.   In 2000, the World Wide Fund for Nature sued the World Wrestling Federation and asked them to change the acronym they used.  On August 10, 2001, a U.K. court ruled in favor of the World Wide Fund …

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First Mass Extinction:  Ordivician-Silurian Extinction Event

The Ordivician-Silurian extinction event occurred around 450 to 440 million years ago.  During this mass extinction 27% of families and 57% of all genera went extinct.  One theory as to why this extinction happened is that the continent called Gondwanaland that included Antarctica, South America, Africa, India and Australia moved close to the south pole …

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Mass Extinctions on Earth

Throughout the history of earth, there have been five mass extinctions that destroyed most of the life on the planet.  These extinction events have been found by studying fossil records.  During a mass extinction, a sharp decrease in the number of species living on earth occurs. First Mass Extinction (Ordivician-Silurian Extinction Event)  This mass extinction event …

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