ghg	emissions_2009_million_tonnes	emissions_1990_million_tonnes	emissions_1950_million_tonnes
CO2	1.76	1.288732214	0.594955859
CH4	0.502	0.470354525	0.235243101
N2O	0.172	0.129200535	0.064408219
PFC,HFC,SF6	0.015	0.0111088	0
Montreal gasses	0.26	0.229976021	0