Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
Total world C02 emissions (million tonnes)
1960: Keeling accurately measures CO2 in the Earth's atmosphere and detects an annual rise
Keeling curve: 320.03
1965: Boulder, Colo. meeting on causes of climate change: Lorenz and others point out the chaotic nature of climate system and the possibility of sudden shifts
Keeling curve: 322.16
1970: First Earth Day. Environmental movement attains strong influence, spreads concern about global degradation
Keeling curve: 328.13
1975: Warnings about environmental effects of airplanes leads to investigations of trace gases in the stratosphere and discovery of danger to ozone layer.
Keeling curve: 333.87
1980: US National Academy of Sciences report finds it highly credible that doubling CO2 will bring 1.5-4.5°C global warming
Keeling curve: 341.46
1985: Ramanathan and collaborators announce that global warming may come twice as fast as expected, from rise of methane and other trace greenhouse gases.
Keeling curve: 348.93
1990: First IPCC report says world has been warming and future warming seems likely
Keeling curve: 357.16
1995: Second IPCC report detects 'signature' of human-caused greenhouse effect warming, declares that serious warming is likely in the coming century.
Keeling curve: 363.75
2000: Global Climate Coalition dissolves as many corporations grapple with threat of warming, but oil lobby convinces US administration to deny problem
Keeling curve: 371.82
2005: Kyoto treaty goes into effect, signed by major industrial nations except US. Work to retard emissions accelerates in Japan, Western Europe, US regional governments and corporations.
Hurricane Katrina and other major tropical storms spur debate over impact of global warming on storm intensity
Keeling curve: 382.25
2010: Copenhagen Conference fails to negotiate binding agreements: end of hopes of avoiding dangerous future climate change
Keeling curve: 393.22