Since 1990, CO₂ Emissions

Since 1990, CO₂ emissions

A) have increased for all fuel types, with projections of future increases for all fuel types.
B) increased through the 1990s and 2000s, but are projected to decrease in the coming decades.
C) increased overall. However, these increases varied by fuel type, with coal actually showing a decrease.
D) decreased through the 1990s and 2000s, but are projected to increase again in the coming decades due to rapid population growth in less developed nations.