In descriptions of Nature one must seize on small details, grouping them so that when the reader closes his eyes he gets a picture. For instance, you'll have a moonlit night if you write that on the mill dam a piece of glass from a broken bottle glittered like a bright little star, and that the black shadow of a dog or a wolf rolled past like a ball.
A tree is beautiful, but what's more, it has a right to life; like water, the sun and the stars, it is essential. Life on earth is inconceivable without trees. Forests create climate, climate influences peoples' character, and so on and so forth. There can be neither civilization nor happiness if forests crash down under the axe, if the climate is harsh and severe, if people are also harsh and severe. ... What a terrible future!
When you want to touch the reader's heart, try to be colder. It gives their grief as it were, a background, against which it stands out in greater relief.
"Do you know," Ivan Bunin recalls Anton Chekhov saying to him in 1899, near the end of his too-short life, "for how many years I shall be read? Seven." "Why seven?" Bunin asked. "Well," Chekhov answered, "seven and a half then."