According to USA Today, the world's last remaining wilderness areas are rapidly disappearing.

These days, more than 77% of land, excluding Antarctica, has been modified by human activities.  Also, 87% of the ocean has been modified by the direct effects of human activities.

From 1993 to 2009, an area of terrestrial wilderness almost five times as big as the state of Texas, about 1.2 million square miles, was lost to human settlement, farming, mining and other pressures.

The authors define wilderness areas as those places that do not have industrial-level activity within them and areas without direct use by people.