When the motor car first came to England in the 1890s, it was a luxury item with little practical purpose - drivers couldn't travel very far or very quickly without paved roads or traffic laws. Thus began a transformation that has affected the architecture, infrastructure, and even the natural envir[...]

The environmental diversity of North America is astounding--from circumpolar tundra with a small number of plants more than a few centimeters tall to the lush semitropical forests of the southeastern United States and the Caribbean Basin. No less remarkable is the record of plant usage by the variou[...]