11.   Selective logging is difficult to detect by satellite, and new growth quickly hides fire damage as viewed from above.

12.   Selective logging, in which only a few of the most valuable trees are logged, also punches holes in the forest canopy.

13.   That said, clear-cutting is not necessarily worse than the selective logging that prevailed in the Sierra Nevada for decades, Blumberg said.

14.   The logging also caused a lot of environmental damage as the loggers did not practise selective logging and did not take precautions to prevent erosion.