污染图示

六月 29, 2007


Lindsay Mangum

The Keeling Curve is named after Charles David Keeling, the first scientist to report that global atmospheric concentrations of carbon dioxide were rising. From the observatory atop Mauna Loa, Hawaii, Keeling began the first continuous record of global carbon dioxide in 1958. Oscillations in the curve represent seasonal fluctuations in carbon dioxide levels. NPR


Lindsay Mangum

 Measurements of temperatures over the course of the 20th century show the planet, on average, has warmed by 1 degree Celsius. Temperature-change computer simulations only match up with observed temperatures if human activity, e.g. burning fossil fuels, is taken into account. The blue-shaded band, based on simulations that only take into account natural systems, such changes in the sun’s output or volcanic eruption, falls short of the temperature change actually observed. NPR

(Note: Green color band stands for computer prediction of temperature change, without fossil fuel use)


Lindsay Mangum

The long-term record of atmospheric carbon dioxide obtained from Antarctic ice cores shows huge fluctuations over the past 150,000 years. Periods of low carbon dioxide concentration correspond to ice ages, while higher carbon dioxide concentrations are linked to warmer periods. NPR

(Note: Scientists studying air bubbles trapped in ice cores have found that over the last 650,000 years, CO2 levels in the atmosphere ranged from about 180 parts per million (ppm) to 300 ppm. Just prior to Britain’s Industrial Revolution, levels hovered at 280 ppm, according to the latest report from the United Nation’s Intergovernmental Panel on Climate Change. CO2 levels had risen to 379 ppm by 2005, and are increasing at an average of nearly 2 ppm per year.

The trend is pretty similar for other major greenhouse gases produced by human activities. Methane concentrations have more than doubled from 715 parts per billion (ppb) in pre-industrial times to 1774 ppb in 2005. And nitrous oxide levels have spiraled from 270 ppb to 319 ppb.)

nucifera 注: 这几个图表在Al Gore的《An Inconvenient Truth》中有更清楚地说明和解释。在这几张图表背后有好些意味,Al Gore作为演说家也非常清楚地对此作出讲解。

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