Community land model is the land model of cesm (community earth system model). This is a collaborative project between the Earth Sciences, climate and global dynamics departments at the National Center for Atmospheric Research (NCAR), as well as the cesm land model and biochemistry working group. Other working groups, such as chemical climate and land ice, have also contributed to CML. The model formalizes and quantifies the concept of ecoclimatology to understand the impact of natural and human changes on climate. The circulation of energy, water, chemical elements and gases in terrestrial ecosystems plays a decisive role in climate change. The model reflects several aspects of surface heterogeneity, including components or sub models related to terrestrial Biogeophysics, hydrological cycle, biogeochemistry, human dimension and ecosystem dynamics.