Global Climate Change
Global Climate Change
Is the world getting warmer or cooler, and is it because of the actions of humans to blame or is it just a natural cycle?
Scientists are concerned that increases in the amount of the greenhouse gas carbon dioxide will result in worldwide temperature increases that will affect the ecosystems of the planet. In the short-term, several species would be expected to become extinct. It is possible that a runaway greenhouse effect could make the earth uninhabitable by all species including us!
CO2 Levels for the Last 650,000 Years
As shown, CO2 levels go through cycles of increase and decrease over 100,000 year intervals, which correspond to eccentricity changes in the earth's orbit. The atmospheric concentration of CO2 was relatively constant at about 280 parts per million (ppm) for about1,000 years before 1750. Since 1750, the CO2 concentration has risen, reaching about 377 ppm in 2005. The inset (small graph in upper right) of figure 1 shows the......
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