One scientist's hobby: Re-creating the ice age
IN CHERSKY, RUSSIA Wild horses have returned to northern Siberia. So have musk oxen, hairy beasts that once shared this icy land with woolly mammoths and saber-toothed cats. Moose and reindeer are here and might one day be joined by Canadian bison and deer.
Later, the predators will come - Siberian tigers, wolves and maybe leopards.
Russian scientist Sergey Zimov is reintroducing these animals to the land where they once roamed in millions to demonstrate his theory that filling the vast emptiness of Siberia with grass-eating animals can slow global warming.
"Some people have a small garden. I have an ice age park. It's my hobby," said Zimov, smiling through his graying beard. His true profession is quantum physics.
Climate change is felt most sharply in the Arctic, where temperatures are warming faster than anywhere else on the planet. Most climate scientists say human activity, especially industrial pollution and the byproducts of everyday living such as home heating and driving cars, is triggering an unnatural warming of the Earth.
Zimov is trying to re-create an ecosystem that disappeared about 10,000 years ago with the end of the ice age, which closed the 2 million-year Pleistocene era and ushered in the global climate as we know it.
He thinks that herds of grazers will turn the tundra, which supports only spindly larch trees and shrubs, into luxurious grasslands. Tall grasses with complex root systems will stabilize the frozen soil, which is thawing at an ever-increasing rate, he said.
Herbivores keep wild grass short and healthy, sending up fresh shoots through the summer and autumn. Their manure gives crucial nourishment. In winter, the animals trample and flatten the snow that otherwise would insulate the ground from the cold air. That helps prevent the frozen ground, or permafrost, from thawing and releasing powerful greenhouse gases. Grass also reflects more sunlight than forests, a further damper to global warming.
It would take millions of animals to change the landscape of Siberia and effectively seal the permafrost. But left alone, Zimov said, the likes of caribou, buffalo and musk oxen multiply quickly. Wherever they graze "new pastures will appear . . . beautiful grassland."
The project is being watched not only by climate scientists but by paleontologists and environmentalists who have an interest in "rewilding."
"This is a very interesting experiment," said Adrian Lister of the Natural History Museum in London. "I think it's valid from an ecological point of view to put back animals that did formerly live there," he told AP Television News.
Middle of nowhere
Zimov began the project in 1989, fencing off 40,000 acres of forest, meadows, shrub land and lakes. It is surrounded by 150,000 acres of wilderness.