Cloud height has declined by 30-40 meters from 2000 to 2010.
The analysis was based on the first 10 years of data collected by the NASA Terra satellite. While there is not enough data to draw definitive conclusions, there is an indication that the reduction in cloud height may affect global warming.
A reduction in global cloud height may create a negative feedback mechanism. As cloud height is reduced, space is cooled more efficiently. This reduces the surface temperature of the Earth and may slow the effects of global warming.Read more at University of Auckland