2. Land-Use Change (primarily tropical deforestation)

1. Burning of fossil fuels

http://eces.org/gallery/

How Are We Increasing the CO2 Concentration?

Fossil fuels still provide ~80% of the world's total energy

needs

http://eces.org/gallery/

CO2 & Global Change

270

280

290

300

310

320

330

340

350

360

370

1750 1800 1850 1900 1950 2000

par

ts p

er m

illi

on b

y vo

lum

e

Mauna Loa (1958-present)

Siple Station (1750-)

Atmospheric Carbon Dioxide (CO2) Concentrations (1750 to

present)

Data Source: C.D. Keeling and T.P. Whorf, Atmospheric CO2 Concentrations (ppmv) derived from in situ air samples collected at Mauna Loa Observatory, Hawaii, Scripps Institute of Oceanography, August 1998. A. Neftel et al, Historical CO2 Record from the Siple Station Ice Core, Physics Institute, University of Bern, Switzerland, Sept. 1994.