[rob74]

Errr, the article you're quoting says:

> Tundra vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens.

So, they want to replace grassland with... grassland (maybe with less shrubs)?

[pvaldes]

The topsoil in tundra is really thin, is rock basically and is ultra-poor and acidic. Very different ecosystems.

To remove the layer of soil is easy but to make it appear again magically... not. You need thousands of years in some cases.