Preface - The Changing Earth Science Network Projects 2009-2011 -- Carbongases - Retrieval and analysis of carbon dioxide and methane greenhouse gases from SCIAMACHY on ENVISAT -- Aerosol direct radiative effect in cloudy scenes retrieved from space-borne spectrometers -- DIagnostics of MIxing and TRansport in atmospheric Interfaces -- Study of the chemistry-climate coupling in the UTLS region with satellite measurements -- Variability of the phytoplankton spring and fall blooms in the Northeastern Atlantic in the 1980s and 2000s -- A method to retrieve temporal averages of 2D ocean surface currents from Synthetic Aperture Radar Doppler shift -- Open Ocean air-sea CO2 fluxes from Envisat in support of global carbon cycle monitoring (OC-flux) -- Active magmatic processes in the East African Rift: A satellite radar perspective. The European Space Agency, through its Support to Science Element (STSE) Programme, funds a network of young post-doc scientists undertaking cutting-edge research in the area of Remote Sensing. This so-called Changing Earth Science Network focuses on the exploitation of Earth Observation (EO) data to address major issues related to the broader context of Climate Change under five scientific research lines: Oceans, Atmosphere, Cryosphere, Land and Solid Earth.