This inconvenient graph has been on the GISS website since 1999, and shows US temperatures cooling since the 1930’s.
On January 18, 2011 the graph was wrecked and appeared as below for a while. Someone had likely tampered with the file.
Modified on Tuesday, January 18, 2011 at 6:33:14 PM
I raised a big stink about, and a few days later the original graph reappeared.