The pie charts compare the proportions of greenhouse gas emissions produced by three groups of countries worldwide in 2002 and provide a forecast for 2030. The bar chart illustrates global carbon dioxide emissions across five sectors in billions of tons.
Overall, the main contributors to CO₂ emissions in both 2002 and the prediction for 2030 are OECD and developing countries, while transition economies remain the smallest contributor in both years. It is also clear that the leading position is expected to shift from OECD countries in 2002 to developing countries in 2030. At the same time, carbon dioxide emissions are predicted to increase in all five sectors, with industry, consumers, and transportation remaining the largest sources, whereas other sectors and waste combustion contribute the least.
To begin with, the proportions of global carbon dioxide emissions show noticeable changes between 2002 and 2030 with a decline in the figures for OECD and transition economy countries and with an increase for developing countries. In 2002, OECD countries dominated with 52%, but their share is expected to fall to 43% by 2030. In contrast, developing countries increase significantly from 38% to 48%, becoming the largest contributor. Meanwhile, transition economies remain the smallest group, declining slightly from 10% to 9%.
The bar chart shows that emissions are forecasted to rise in all sectors over time. The Industry sector remains the biggest source, growing from about 10 to 12 billion tons. The Consumer sector also increases notably from around 6 to 9 billion tons, while Transportation sector doubles from roughly 3 to 6 billion tons. By comparison, Waste combustion sector and Other sectors contribute far less, with almost the same figures (1billion tons) in 2002 and prognosed to experience a minor growth by 2030.