Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 46, Problem 2DAA
Summary Introduction

To determine: The number of times carbon dioxide reach a level during 400, 000 B.C. and 0 A.D comparable to that measured in 1980.

Introduction: The carbon dioxide concentration is rising, and the present-day concentration is highest in 15 million years. It is more of as result of human activities that contributed in increase in carbon dioxide level in the Earth’s atmosphere. The major contribution is by burning of fossil fuels that releases high amounts of carbon in the atmosphere. This impacts climate and ecosystems.

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Which of the following statements about the carbon dioxide emitted to the atmosphere by human activities each year is most accurate?   a. About half of it remains in the atmosphere and the other half is split equally between uptake by the oceans and vegetation.   b. Nearly all of it remains in the atmosphere.   c. About half of it dissolves in the oceans.   d. On an annual basis, human-caused emissions of carbon dioxide are small compared to volcanic emissions.   e. Human-caused emission of carbon dioxide is much greater than that emitted by respiration of all plants, animals, and microorganisms.
Which of the following statements about atmospheric carbon dioxide levels is correct?     For about 800,000 years prior to human influence it varied between 180 and 300 ppm and is now above 410 ppm.     For about 800,000 years prior to human influence it never exceeded 200 ppm.     Its rate of increase in the past century is greater than any seen in the ice core record.     Both 1 & 3
1Which of the following is NOT a consequence of global climate change? coral bleaching more ice at the North and South Poles increases in diseases such as malaria and dengue fever rising sea levels   2How do scientists determine the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago? They deduce it from the carbon dioxide content of fossil fuels. They measure it from bubbles of gas trapped in Antarctic ice cores. They estimate it from the numbers of carbon-based life forms that existed over time. They calculate carbon dioxide levels from the temperature records. Scientists do not know the atmospheric levels of carbon dioxide thousands of years ago.     3The two factors that are responsible for the climate of an area are: the number and size of different kinds of species the position of the area in relation to island chains the elevation of the area, and its tree cover the amount of rainfall and temperature. the…
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  • Changes in the Air To assess the impact of human activity on the carbon dioxide level in Earth's atmosphere, it helps to take a long view. One useful data set comes from deep core samples of Antarctic ice. The oldest ice core that has been fully analyzed dates back a bit more than 400,000 years. Air bubbles trapped in the ice provide information about the gas content in Earth's atmosphere at the time the ice formed. Combining ice core data with more recent direct measurements of atmospheric carbon dioxideas in FIGURE 46.20can help scientists put current changes in the atmospheric carbon dioxide into historical perspective. FIGURE 46.20 Changes in atmospheric carbon dioxide levels (in parts per million). Direct measurements began in 1980. Earlier data are based on ice cores. 4. Was the rise in the carbon dioxide level between 1800 and 1975 larger or smaller than the rise between 1980 and 2013?
    Changes in the Air To assess the impact of human activity on the carbon dioxide level in Earth's atmosphere, it helps to take a long view. One useful data set comes from deep core samples of Antarctic ice. The oldest ice core that has been fully analyzed dates back a bit more than 400,000 years. Air bubbles trapped in the ice provide information about the gas content in Earth's atmosphere at the time the ice formed. Combining ice core data with more recent direct measurements of atmospheric carbon dioxideas in FIGURE 46.20can help scientists put current changes in the atmospheric carbon dioxide into historical perspective. FIGURE 46.20 Changes in atmospheric carbon dioxide levels (in parts per million). Direct measurements began in 1980. Earlier data are based on ice cores. The industrial revolution occurred around 1800. What was the trend in carbon dioxide level in the 800 years prior to this event? What about in the 175 years after it?
    Greenhouse gases ________. a. slow the escape of heat from Earth into space b. are produced by natural and human activities c. are at higher levels than they were 100 years ago d. all of the above
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