Global warming.I thoroughly enjoyed and agreed with the articles on global warming (September 18 issue) by Dennis Behreandt, wherein he suggested that solar activity is to blame for the alleged rise in the "earth temperature," a questionable parameter to begin with. Let us not forget that back in 1975 scientists were gloomily predicting a new ice age, apparently unaware of the rise in global temperatures taking place in about that same range of years, according to the new "hockey stick" graph, as best as I can read it. Why were they then predicting a new ice age when the graph clearly indicates what is now regarded as an alarming rise in Earth temperatures? The case for anthropogenic an·thro·po·gen·ic adj. 1. Of or relating to anthropogenesis. 2. Caused by humans: anthropogenic degradation of the environment. global warming necessarily rests upon the presumptions that (1) the sun is an isotropic Refers to properties that do not differ no matter which direction is measured. For example, an isotropic antenna radiates almost the same power in all directions. In practice, antennas cannot be 100% isotropic. and isochronous Time dependent. Real time voice, video and telemetry are examples of isochronous data. (communications) isochronous - /i:-sok'rn-*s/ A form of multiplexing that guarantees to provide a certain minimum data rate, as required for time-dependent data such as video or audio. radiator, and (2) that the energy density of space, filled with electromagnetic radiation electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an across the entire electromagnetic spectrum electromagnetic spectrum Total range of frequencies or wavelengths of electromagnetic radiation. The spectrum ranges from waves of long wavelength (low frequency) to those of short wavelength (high frequency); it comprises, in order of increasing frequency (or decreasing from trillions of cosmic radiators, is a constant. Both of these propositions are preposterous, and as a result, one must be led to the conclusion put forward in your article that any heating of the Earth, and there may be some evidence that such is taking place, is due to cosmic influences, about which we can do nothing. JOHN D. S. MUHLENBERG Vienna, Virginia |
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