What Do We Know About Climate Change?
- The atmospheric concentrations of carbon dioxide(CO2) and methane(CH4) have increased by 31% and 149% respectively above pre-industrial levels (1750 AD).
- The principal sectors contributing to increase in concentration of green house gases (GHGs) include energy, industry, agriculture and forestry.
- About three-quarters of man-made emissions are due to fossil fuel burning(coal and oil).
- Global average air temperature near the Earth’s surface has risen by 0.74 ± 0.18 °C during the past century.
- The average global sea level rose at an average rate of 1.8 mm per year between 1961 to 2003 and by 3.1 mm per year between 1993 to 2003.
- Maximum temperature is projected to increase by 2-4 °C by the 2050s.
- Climate models referenced by the IPCC project that global surface temperatures are likely to increase by 1.1 to 6 °C by the end of this century.