Global Warming is officially recognized as one of the aspects to the Earth’s climate change; and its major factor is a sharp anthropogenic increase in concentration of greenhouse gases, especially carbon dioxide (CO2). However many scientists do not agree with this view and do not consider the anthropogenic factor as its basic reason, thus regarding measures for limiting greenhouse gas emissions as useless. The authors believe that a real reason is lack of unequivocal ideas in the framework of the Earth Science. The objective of the research presented in the article is: to establish true reasons for global catastrophes, global warming, their rapid increase of recent decades, and their hazard level, as well as to reveal their nature and actual mechanisms. The authors critically analyzed and compared the existing data on global processes and catastrophes on Earth from ancient times to nowadays, revealed their actual mechanisms on the basis of Submicro- and Macrocolloid Chemistry and Physical-Chemical Mechanics of Earth, a new science on Earth set up by the authors. The authors demonstrated that the motive power of all global phenomena and processes on Earth is the electric force, conditioned by the surplus negative electric charge of Earth, and the reason of the approaching global catastrophe is an abnormal increase of the charge in recent decades. The article deals with critical analysis of experimental data on dynamics of global catastrophes, among them the change in Earth’s temperature and level of ocean, a greater amount of carbon gas and atmosphere dust.