Some social media commenters on last week’s Getting warmer: the State of the Climate in five charts, reckon it makes better sense to show climate changes in a long-term context. So here are three charts that go back further (one to 1000 and two to 1840).
Most of the CO2 emissions from human activities are from fossil-fuel combustion and land-use change (top graph)…CO2 emissions from human activities have been taken up by the ocean, by land vegetation, or remain in the atmosphere (middle graph). There has been an increase in the atmospheric concentration of CO2, as identified by the trend in the ratio of different types (isotopes) of carbon in atmospheric CO2 (bottom graph). CO2 and the carbon-13 isotope ratio in CO2 (δ13C) are measured from air in Antarctic ice and firn (compacted snow) samples from the Australian Antarctic Science Program, and at Cape Grim (northwest Tasmania).