Mosaic of images of the Arctic by MODIS. Credit: NASA The wide-scale introduction of large herbivores to the Arctic tundra to restore the "mammoth steppe" grassland ecosystem and mitigate global warming is economically viable, suggests a new paper from the University of Oxford. Grazing animals such as horses and bison are known to engineer the landscape around them, for example suppressing the growth of trees by trampling or eating saplings. When this process is […]