The greatest threat to biodiversity today is habitat loss and alteration. Across the globe, habitat for wild plants and animals is shrinking at alarming rates as human populations expand.

Off-road vehicles, for example, endanger fragile habits such as California or Oregon sand dunes, which are home to dozens of native species that grow nowhere else.

Habitat of Sand-dune Phacelia ( Phacelia argentea) and habitat of a dune primrose.