Remote sensing has been used for improving understanding of the climate system and its changes. It enables to monitor the Earth's surface, ocean and atmosphere at several spatio-temporal scales, thus allowing climate system observations, as well as investigating climate-related processes or long and short-term phenomena. Remote sensing techniques, and specifically satellite images, have been successfully used in a wide range of climate change fields, such as for (i) investigating global temperature trends, both at the ocean surface and in the atmosphere, (ii) detecting changes in solar radiation affecting global warming, (iii) monitoring aerosols, water vapour concentration, and changes in precipitation regime, (iv) studying the dynamics of snow extension and ice cover, (v) monitoring sea-level changes and coastal modifications, (vi) monitoring vegetation status and change, (vii) monitoring water resources and impact due to droughts and dry periods, (viii) monitoring fire events and fire emissions, (ix) predicting disaster risk, such as cyclone, floods, and drought, (x) guiding decision-making processes on climate change adaptation. In conclusion, remote sensing has been instrumental in climate change research by providing data and information about various aspects of the Earth system. It has allowed scientists to monitor changes in the Earth's climate system over time and to investigate the underlying processes driving these changes. This information is critical for understanding the impacts of climate change on our planet and for developing effective strategies for adapting to its effects.