According to the Planet “vital signs”, climate is changing mainly due to anthropogenic factors. This work aims to address the main aspects of climate change with a strict approach, starting from its mechanisms and impacts on life, switching to mitigation and adaptation actions, going through the most updated scientific literature. Seven climate development scenarios are worked out using Java Climate Model (JCM). Global Mean Temperature (GMT) started to increase in 1880 and is getting momentum: 2016, 2015, 2017, 2018, 2014 are the “top five” warmest years on record. 2019 is on track to be the new third. The anomaly w.r.t. 1880 ranges from 0.74 °C to 0.94 °C.