Energy-related CO2 emissions have risen by 1.7% compared to preceding year and broken a historic record of 33.1 Gt CO2 in 2018 according to International Energy Agency's report. The huge amounts of CO2 emissions in 2018 was caused by the growth of global energy demand by 2.3%, driven by global economy and high demand of heating and cooling.
According to the International Energy Agency (2019) through their publication "Global Energy and CO2 Status Report 2018", the demand of all type of fuels has risen, include fossil fuels and renewable energy. Oil and natural gas demand grew by 1.3% and 4.6% respectively. The growth of natural gas demand was the largest increase since 2010. The switch from coal to gas in power generation sector and heat production were responsible for the increasing of natural gas consumption. Coal demand was also increase by 0.7%, although it was already replaced by gas in some sector.
Nuclear and renewable energy have also risen by 3.3% and 4% according to International Energy Agency. Renewable energy contributed for almost 45% of world's electricity generation growth. Electricity as a future main energy rose by 4% in 2018.