The document discusses climate modeling and simulations performed at the German Climate Computing Center (DKRZ). It provides an overview of DKRZ's high performance computing capabilities and describes the components and coupling of Earth system models. It also summarizes simulations contributed to the CMIP5/IPCC AR5 project, including temperature and sea ice projections under different scenarios. Visualization of simulation output is discussed along with the Avizo Green software developed in collaboration with DKRZ.