Common Contaminants in Urban Watersheds - Urban Watersheds: Geology, Contamination, and Sustainable Development - page 257

United States
20.6%

EU-27
15.0%

Others
21.2%

Japan
4.4%

Mexico
1.6%

Russia
5.7% Canada

2.1%

Brazil
1.2%

Korea
1.7%

China
21.7%

India
4.7%

FIGURE 7.24
2007 Greenhouse gas contribution by country. (From Europeon Commission Directorate—General for Energy
and Transport, Chapter 4.2, Environment, http://ec.europa.eu/energy/publications/doc/statistics/part_4_
energy_pocket_book_2010.pdf (accessed August 8, 2010), 2010.)

F-gases
1.1%

NO 2
7.9%

CH 4
14.3%

CO 2 fossil
fuel use
56.6%

CO 2
(deforestation,
decay of
biomass, etc.)
17.3%

CO 2 (other)
2.8%

FIGURE 7.25
Greenhouse gas contributions. (From United States Environmental Protection Agency, Global Greenhouse Gas
Data, http://www.epa.gov/climatechange/emissions/globalghg.html, (accessed July 2, 2010), 2010b.)

anthropogenically. The human body produces a small amount of CO when red blood
cells convert protoporphyrin into bilirubin. Synthetically, most carbon monoxide is cre-
ated by the incomplete combustion of fossil fuels, with the highest percentage coming
from automobile exhaust. Inside homes, significant sources of carbon dioxide emissions
can be natural gas and home heating oil furnaces, hot water heaters, appliances, wood