No, to create the same amount of thermal energy, burning gas produces about 30% less CO2. The main reason is, that coal is pretty much pure carbon while gas is

No, to create the same amount of thermal energy, burning gas produces about 30% less CO2. The main reason is, that coal is pretty much pure carbon while gas is mostly CH4, so you are burning carbon and hydrogene. That is also the reason, hydrogene is mostly produced by splitting natural gas and producing CO2 along.