3 Quotes by Chris D. Thomas

Jens-Christian Svenning, a tall, crazy-golf-playing scientist from Aarhus University in Denmark, worked out that as many as thirty-one genera of trees that were native to Europe between 5.3 and 2.6 million years ago have since become extinct, whereas thirty-five have survived in the region. If you had taken a grand tour of Europe 3 million years ago, you would have encountered double the diversity of native trees.

The success of Asian and North American trees is partly down to the absence of similar European evergreens, which died out during the ice ages.

Foreign species are acting like any other species: a few have major impacts, but most don’t. Because a large majority of them have such limited impacts, the importation of lots of new species almost always increases the numbers of species in any given location, just as we saw in the forests and waters of Lake Maggiore. When lots of new arrivals establish breeding populations, hardly any ‘natives’ die out as a consequence.