Now compare the change in gdp to the change in co2 emissions from electricity generation. if gdp more than doubled from 1980 to 2005, what is the ratio of changes in co2 emissions to changes in gdp for that period of time? a exactly 1: 1, so co2 emissions increased at the same rate as gdp increasedb less than 1: 1, with co2 emissions declining as gdp increasedc greater than 1: 1, showing a slight co2 increase per unit of economic activityd greater than 2: 1, with co2 emissions per unit of economic activity doubling