Remains found in a ditch along a gravel road

These remains were found in a ditch along a gravel road, at the edge of a National Forest. No further info. The rate of decomposition depends on the temperature, ground conditions, amount of clothing, size of the body, etc. For example, a body in a warm climate will not only encourage insect attack from the outside, but will also increase the interior bacteria development and subsequent tissue attack from within. As the tissues inside are destroyed and enzymes released, the gases formed emit a foul and sickening smell.