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Earth is Becoming a Greener Greenhouse Background: Plant growth in the northern latitudes is seasonal, that is, growth begins with the arrival of Spring, peaks during the summer and declines towards the end of Autumn. These temporal changes in plant growth can be monitored by sensors onboard satellites, year after year. The data thus collected over a period of time, say 20 years, can be used to answer the following questions ...
Has the greenness level increased or decreased? Our results, shown in the figure below, indicate that the April to October average greenness
level increased by about 8% in North America and 12% in Eurasia during the period 1981 to 1999.
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Sep-04-2001 |
