Ahem, at least TWO VERY LARGE MISTAKES, BONZO.

1) The adjustments and corrections to raw
USHCN are not done by GISS or Hansen. The
NOAA does this work.

2) USHCN data covers the continental US,
which is less than 1 and a half percent
of global area. These data have a very
small effect on the global mean surface
temperature series.