Global Warming Index (GW) — measured by the amount carbon dioxide emissions in metric tons. Global warming is the process of gradual rise of average annual temperature of the Earth atmosphere and the World Ocean. As stated by the United Nations Interstate commission of experts on climate changing (ICECC), and national academies of sciences of G-8 countries, the average temperature on the Earth has risen by 1°C from the end of XIX century, and “major part of the warming observed in the last 50 years is caused by human activity”, first of all, it is due to emissions of the gases causing greenhouse effect, such as carbon dioxide (CO2) and methane (CH4).