Intermediate between the two classes stands the soil, on which all living resources depend. While the soil is part of the mineral and earthy resources of the planet, it nevertheless can be increased in its producing power. Even after all minerals and metals and coal are depleted, the race may sustain itself in comfort and progress so long as the soil is productive, provided, of course, that water and air and sunshine are still left to us. The greatest of all resources that man can make or mar is the soil. Beyond all the mines of coal and all the precious ores, this is the heritage that must be most carefully saved; and this, in particular, is the country-life phase of the conservation movement.
To my mind, the conservation movement has not sufficiently estimated or emphasized this problem. It has laid stress, I know, on the enormous loss by soil erosion and has said something of inadequate agricultural practice, but the main question is yet practically untouched by the movement,—the plain problem of handling the soil by all the millions who, by skill or blundering or theft, produce crops and animals out of the earth. Peoples have gone down before the lessening fertility of the land, and in all probability other peoples will yet go down. The course of empire has been toward the unplundered lands.
The soil crust.
Thinner than a skin of an apple is the covering of the earth that a man tills. The marvelously slight layer that the farmer knows as "the soil," supports all plants and all men, and makes it possible for the globe to sustain a highly developed life. Beyond all calculation and all comprehension are the powers and the mysteries of this soft outer covering of the earth. For all we know, the stupendous mass of materials of which the planet is composed is wholly dead, and only on the surface does any nerve of life quicken it into a living sphere. And yet, from this attenuated layer have come numberless generations of giants of forests and of beasts, perhaps greater in their combined bulk than all the soil from which they have come; and back into this soil they go, until the great life principle catches up their disorganized units and builds them again into beings as complex as themselves.
The general evolution of this soil is toward greater powers; and yet, so nicely balanced are these powers that within his lifetime a man may ruin any part of it that society allows him to hold; and in despair he throws it back to nature to reinvigorate and to heal. We are accustomed to think of the power of man in gaining dominion over the forces of nature,—he bends to his use the expansive powers of steam, the energy of the electric current, and he ranges through space in the light that he concentrates in his telescope; but while he is doing all this, he sets at naught the powers in the soil beneath his feet, wastes them, and deprives himself of vast sources of energy. Man will never gain dominion until he learns from nature how to maintain the augmenting powers of the disintegrating crust of the earth.
We can do little to control or modify the atmosphere or the sunlight; but the epidermis of the earth is ours to do with it much as we will. It is the one great earth-resource over which we have dominion. The soil may be made better as well as worse, more as well as less; and to save the producing powers of it is far and away the most important consideration in the conservation of natural resources.
Unfortunately, it is impossible to devise a system of farm accounting that shall accurately represent the loss in producing power of the land (or depreciation in actual capital stock). The rising sentiment on the fertility question is just now reflected in the proposal to ask Congress and the states to make it a misdemeanor for a man to rob his land and to lay out for him a farm scheme. This is a chimerical notion; but the people are bound to express themselves unmistakably in some way on this subject.
Even if we should ultimately find that crops do not actually deplete land by the removal of stored plant-food in the way in which we have been taught, it is nevertheless true that poor management ruins its productivity; and whatever the phrase we use in our speaking and writing, we shall still need to hold the land-usurer to account.
No man has a right to plunder the soil.
The man who tills and manages the soil owes a real obligation to his fellow-men for the use that he makes of his land; and his fellow-men owe an equal obligation to him to see that his lot in society is such that he will not be obliged to rob the earth in order to maintain his life. The natural resources of the earth are the heritage and the property of every one and all of us. A man has no moral right to skin the earth, unless he is forced to do it in sheer self-defense and to enable him to live in some epoch of an unequally developed society; and if there are or have been such social epochs, then is society itself directly responsible for the waste of the common heritage. We have given every freeholder the privilege to destroy his farm.