He has also pointed out that the USGS failed to extrapolate past discovery trends in the world 's mature basins .
Campbell believes OPEC countries raised their reserves to get higher oil quotas and to avoid internal critique .
Campbell has also pointed out that the USGS failed to extrapolate past discovery trends in the world 's mature basins .
Campbell believes OPEC countries raised their reserves to get higher oil quotas and to avoid internal critique .