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NCSU BIO 181 - Human Activities Causing Decline

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Bio 181 1st Edition Lecture 18Past LectureI. Nutrition/ EnvironmentII. Feeding Adaptation of organismsIII. Trophic LevelsIV. Plant transportationsCurrent LectureI. Human activitiesII. Carbon dioxide removal I. Human activities contribute to declining biological diversityA. endengered species leading to extinction. This can happen due to environmental variation, catastrophes and loss of genetic diversity.1. It seems as human population increases, so does number of extinct species.2. Humans have decreased biodiversity by pollution. Affecting the food chain causing some animals to survive and the lost of more animals.B. Fragmentation of habitats, done by deforestation. 1. Introduced species, invasive or exotic species which comes from a different geographic location. 2. These invasive species can disturb community or reduce biodiversity.3. Toxins such as pesticides also cause problems for habitats as well, like acid rain, PCBs and Phthalates.C. Also global warming which is seen as the long-term increase in earth’s average temperatures.1. It is caused by greenhouse gases like carbon dioxide, methane, nitrous oxide. 2. also using fossil fuels can cause issues as well.II. Carbon dioxide removal A. Sequester CO2 from coal plants-inject emissions into stable underground formations (expensive)1. Artificial trees which draw CO2 underground or bind it to other chemicals to neutralize its greenhouse effect B. Ocean fertilization with iron particles, increases plankton growth leading to Carbon dioxide removal.1. When plankton die, carbon dioxide remains on sea floor with them allowing for less carbon dioxide in the


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