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During the trek, we passed through cultivated land, rain forest, heath, moorland and alpine desert before an arctic summit.

Habitats on land — rain forests, steppes, woodlands, deserts, alpine meadows, all well explored over the centuries — make up less than 1 percent of the planet’s biosphere.

But last week, on much of the parched land, rain fell.

One hundred and twenty miles of half-flooded prairie trail—camping out at night in the solitude of the Great Lone Land—rain—muskegs—Indian guides—nothing had any terror for my dauntless cousin.