Energy and Electricity - Introduction to Carbon Capture and Sequestration - page 7

Mtoe

12500

10000

7500

5000

2500

0

64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 10 12

Year

Fossil fuels Non-fossil fuels

Oil Coal Natural Gas Nuclear Hydroelectricity Renewables

Figure 1.2.1 World energy consumption
World primary energy consumption grew by 2.5% in 2011, less than half the growth rate
experienced in 2010 but close to the historical average. Oil remains the world's leading
fuel, accounting for 33.1% of global energy consumption, which is the lowest share on
record. Coal's market share of 30.3% was the highest since 1969. Oil, coal and natural
gas are fossil fuels while the others are non-fossil fuels. Figure based on data from BP
Statistical Review of World Energy [1.2].

Table 1.2.1 CO 2 production in tonne per tonne fuel

Source CO 2

oil 3.0

gas 2.7

coal 4.4

Important questions remain. Where does all the CO 2 go after it has
been emitted? Is the total amount of CO 2 we have emitted large or small
compared to the CO 2 that is already present in the atmosphere? We will
come back to these questions in Chapter 3, where we discuss the carbon
cycle.