It is on NASA's website and was released by them. From all reports it’s the most accurate record of polar cap measurements. No politics involved just measurements over time. I am not at all worried about Global Warming just like my father was not concerned about global cooling reported in the 1970's. China and many of the 3 world counties are not going to do anything to reduce their negative affects on the environment, but I believe regardless that fact the US can do its part without damaging the economy, etc.