Ice Ages and Global Warming Thousands of years ago there were no spots on the sun. They began to appear, they have increased in number, and they will continue to increase. Hence there will come a time when the sun will radiate less and less strongly, and finally, when it has become completely dark, it will cease to radiate any light at all. Therefore we have to reckon with the fact that in the course of time, a comparatively long time, the source of the light and life that now issues from the sun will be physically obliterated for the earth. And so the phenomenon of the sunspots Ñ among other things Ñ shows clearly that one can speak of the earth coming to an end. Everything of the earth that is spiritual will then take on a different form, just as I have told you that in olden times it had a different form. Just as a human being grows old and changes, so the sun and the whole planetary system will grow old and change. A good or bad vintage year, for example, is connected with phenomena such as the sunspots, also with the appearance of comets. Only when they are observed in connection with phenomena in the heavens can happenings on the earth be studied properly. Now of course still other matters must be considered if one is looking for the reasons for abnormal weather. For naturally the weather conditions Ñ which concern us so closely because health and a great deal else is affected by them Ñ depend upon very many factors. You must think of the following. Going back in the evolution of the earth we come to a time of about six to ten thousand years ago. Six to ten thousand years ago there were no mountains in this region where we are now living. You would not have been able to climb the Swiss mountains then, because you would not have existed in the way you do now. You could not have lived here or in other European lands because at that time these regions were covered with ice. It was the so-called Ice Age. This Ice Age was responsible for the fact that the greatest part of the population then living in Europe either perished or was obliged to move to other regions. These Ice Age conditions will be repeated, in a somewhat different form, in about five or six or seven thousand years Ñ not in exactly the same regions of the earth as formerly, but there will again be an Ice Age. It must never be imagined that evolution proceeds in an unbroken line. To understand how the earth actually evolves it must be realized that interruptions such as the Ice Age do indeed take place in the straightforward process of evolution. What is the reason? The reason is that the earth's surface is constantly rising and sinking. If you go up a mountain which need by no means be very high, you will still find an Ice Age, even today, for the top is perpetually covered with snow and ice. If the mountain is high enough, it has snow and ice on it. But it is only when, in the course of a long time, the surface of the earth has risen to the height of a mountain that we can really speak of snow and ice on a very large scale. So it is, gentlemen! It happens. The surface of the earth rises and sinks. Some six thousand or more years ago the level of this region where we are now living was high; then it sank, but it is now already rising again, for the lowest point was reached around the year 1250. That was the lowest point. The temperature here then was extremely pleasant, much warmer than it is today. The earth's surface is now slowly rising, so that after five or six thousand years there will again be a kind of Ice Age. From this you will realize that when weather conditions are observed over ten-year periods, they are not the same; the weather is changing all the time. Now if in a given year, in accordance with the height of the earth's surface a certain warm temperature prevails over regions of the earth, there are still other factors to be considered. Suppose you look at the earth. At the equator it is hot; above and below, at the Poles it is cold. In the middle zone, the earth is warm. When people travel to Africa or India, they travel into the heat; when they travel to the North Pole or the South Pole, they travel into the cold. You certainly know this from accounts of polar expeditions. Think of the distribution of heat and cold when you begin to heat a room. It doesn't get warm all over right away. If you would get a stepladder and climb to the top of it, you would find that down below it may still be quite cold while up above at the ceiling it is already warm. Why is that? It is because warm air, and every gaseous substance when it is warmed, becomes lighter and rises; cold air stays down below because it is heavier. Warmth always ascends. So in the middle zone of the earth the warm air is always rising. But when it is up above it wafts toward the North Pole: winds blow from the middle zone of the earth toward the North Pole. These are warm winds, warm air. But the cold air at the North Pole tries to warm itself and streams downward toward the empty spaces left in the middle zone. Cold air is perpetually streaming from the North Pole to the equator, and warm air in the opposite direction, from the equator to the North Pole. These are the currents called the trade winds. In a region such as ours they are not very noticeable, but very much so in others. Not only the air, but the water of the sea, too, streams from the middle zone of the earth toward the North Pole and back again. That phenomenon is, naturally, distributed in the most manifold ways, but it is nevertheless there. But now there are also electric currents in the universe; for when we generate wireless electric currents on the earth we are only imitating what is also present in some way in the universe. Suppose a current from the universe is present, let's say, here in Switzerland, where we have a certain temperature. If a current of this kind comes in such a way that it brings warmth with it, the temperature here rises a little. Thus the warmth on earth is also redistributed by currents from the universe. They too influence the weather. In addition, however, you must consider that such electromagnetic currents in the universe are also influenced by the sunspots. Wherever the sun has spots, there are the currents which affect the weather. These particular influences are of great importance. Now in regard to the division of the seasons - spring, summer, autumn, winter Ñ there is a certain regularity in the universe. We can indicate in our calendar that spring will begin at a definite time, and so on. This is regulated by the more obvious relationships in which the heavenly bodies stand to one another. But the influences resulting from this are few. Not many of the stars can be said to have an influence; most of them are far distant and their influence is only of a highly spiritual character. (Rudolf Steiner, Evolution of the Earth and Man and The Influence of the Stars, Lecture XI; September 13, 1924; Dornach; GA0354) SUBMIT AN ARTICLE posted: February 10, 2007