Who knows how many times you will read: " The climate has always changed, so there is nothing unusual about today's change. ". Well, for the layman, let's be clear. Earth's climate has always shown a cyclical alternation between glacial and interglacial periods, which marked the beginning of the modern climate era and human civilization almost 10,000 years ago. These are changes attributed to small orbital variations capable of modifying the amount of solar energy received by our planet. However, direct observations show that Earth's climate is warming at an unprecedented rate. The advent of satellites and technology in orbit has allowed climate scientists to gain insight and a wealth of information on a global scale. A dataset that reveals signs of a changing world in the atmosphere, ocean, cryosphere and biosphere. (Renato Sansone, more at geomagazine.it)