Climate change is causing significant mass loss of glaciers in high  
mountains worldwide. Although glacier systems show a great amount of  
inherent complexity and variation, there are clear overall trends  
indicating global glacier recession, which is likely to accelerate in  
coming decades. Large gaps remain in our understanding and ability to  
model accurately the key processes and cause-effect relationships  
driving glacier response to climate change. In addition, a lot of data  
on glacier mass changes are not available to the public due to national 
 interests concerning water supply.
 

 
