Below I quote the last fifth of a lecture delivered by John Tyndall, Esq. F.R.S. to the Royal Society on Friday 23rd January 1863, unabridged.
On Radiation through the Earth’s Atmosphere.
“No doubt, therefore, can exist of the extraordinary opacity of this substance (water vapour) to the rays of obscure heat; and particularly such rays as are emitted by the earth after it has been warmed by the sun. It is perfectly certain that more than ten per cent, of the terrestrial radiation from the soil of England is stopped within ten feet of the surface of the soil. This one fact is sufficient to show the immense influence which this newly-discovered property of aqueous vapours must exert on the phenomena of meteorology.
This aqueous vapour is a blanket more necessary to the vegetable life of England than clothing is to man. Remove for a single summer-night the aqueous vapour from the air which overspreads this country, and you would assuredly destroy every plant capable of being destroyed by a freezing temperature. The warmth of our fields and gardens would pour itself unrequited into space, and the sun would rise upon an island held fast in the iron grip of frost. The aqueous vapour constitutes a local dam, by ‘which the temperature at the earth’s surface is deepened: the dam, however, finally overflows, and we give to space all that we receive from the sun.
The sun raises the vapours of the equatorial ocean ; they rise, but for a time a vapour screen spreads above and around them. But the higher they rise, the more they come into the presence of pure space; and when, by their levity, they have penetrated the vapour screen, which lies close to the earth’s surface, what must occur ?
It has been said that, compared atom for atom, the absorption of an atom of aqueous vapour is 16,000 times that of air. Now the power to absorb and the power to radiate are perfectly reciprocal and proportional. The atom of aqueous vapour will therefore radiate with 16,000 times the energy of an atom of air. Imagine then this powerful radiant in the presence of space, and with no screen above it to check its radiation. Into space it pours its heat, chills itself, condenses, and the tropical torrents are the consequence. The expansion of the air, no doubt, also refrigerates it; but in accounting for those deluges, the chilling of the vapour by its own radiation must play a most important part. The rain quits the ocean as vapour; it returns to it as water. How are the vast stores of heat set free by the change from the vaporous to the liquid condition disposed of? Doubtless in great part they are wasted by radiation into space. Similar remarks apply to the cumuli of our latitudes. The warmed air, charged with vapour, rises in columns, so as to penetrate the vapour screen which hugs the earth; in the presence of space, the head of each pillar wastes its heat by radiation, condenses to a cumulus, which constitutes the visible capital of an invisible column of saturated air.
Numberless other meteorological phenomena receive their solution, by reference to the radiant and absorbent properties of aqueous vapour. It is the absence of this screen, and the consequent copious waste of heat, that causes mountains to be so much chilled when the sun is withdrawn. Its absence in Central Asia renders the winter there almost unendurable; in Sahara the dryness of the air is sometimes such, that though during the day “ the soil is fire and the wind is flame,” the chill at night is painful to bear. In Australia, also, the thermometrie range is enormous, on account of the absence of this qualifying agent. A clear day, and a dry day, moreover, are very different things. The atmosphere may possess great visual clearness, while it is charged with aqueous vapour, and on such occasions great chilling cannot occur by terrestrial radiation. Sir John Leslie and others have been perplexed by the varying indications of their instruments on days equally bright—but all these anomalies are completely accounted for by reference to this newly-discovered property of transparent aqueous vapour. Its presence would check the earth’s loss; its absence, without sensibly altering the transparency of the air, would open wide a door for the escape of the earth’s heat into infinitude.”
The most important passage is this:
“It is perfectly certain that more than ten per cent, of the terrestrial radiation from the soil of England is stopped within ten feet of the surface of the soil.”
At 10 feet therefore, at least 10% of the Earth’s radiation has been transferred to the water vapour in the air and 90% remains. At the height of Nelson’s column of 170 feet, only 16% of this radiation remains and at twice that height, less than 3% remains.
The “blanket” is just high enough to contain the highest tree, a redwood which stands at 379.7 feet, and saves vegetation from being roasted during the day and often free from frost at night.
This lecture was given in 1863 and by 1995 corrupt politicians and pressure groups had managed to influence sufficient scientists to have the nonsensical Global Warming Theory treated as fact, have it published in schoolbooks and even now still try to fool populations that carbon dioxide is a poison.
For example the United States Environmental Protection Agency formally declared CO2 a dangerous pollutant. This “Dangerous Pollutant” is of course necessary for the life of all vegetation and mankind and the above declaration just demonstrates how foolish the political class can be.
The variation of carbon dioxide in the atmosphere follows (by 200-500 years, it has been said) the natural change in global temperature due to the cyclic variation in the behaviour of the Sun. It cannot be possible for it to precede the mega effect brought about by changes in the Sun’s output.
Compare this “blanket” of moisture laden air with water content of some 20,000ppm at 20°C, to atmospheric carbon dioxide at either 300ppm in 1860 or 400ppm today. Does a change of 100ppm make any difference to world temperatures? Of course not, and over desert regions there is no moisture present to prevent the earth from radiating its heat into space after it has been warmed during the day.
It is worth repeating how excess heat from the Earth is disposed of;
“Imagine then this powerful radiant in the presence of space, and with no screen above it to check its radiation. Into space it pours its heat, chills itself, condenses, and the tropical torrents are the consequence. The expansion of the air, no doubt, also refrigerates it; but in accounting for those deluges, the chilling of the vapour by its own radiation must play a most important part. The rain quits the ocean as vapour; it returns to it as water.”
Politics has corrupted science. Case proven.