The GRACE Project has been measuring Earth's gravitational field for ten years now, and is helping to study climate change here on Earth.  The results show the change in the ice melt of Greenland; that it has MORE than doubled from 2002 to 2009 alone, and it is still increasing.  
See here:  http://podaac.jpl.nasa.gov/GRACE  
And also here:  http://www.jpl.nasa.gov/news/news.php?release=2012-036