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Lecture 13

ENVIRON 157 Lecture Notes - Lecture 13: Global Carbon Project, Tonne, Carbon Cycle

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Anupom Ganguli

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PUB POL Week 5 lect 2
All the data is shown in billion tonnes CO2 (GtCO2)
1 Gigatonne (Gt) = 1 billion tonnes = 1×1015g = 1 Petagram (Pg)
1 kg carbon (C) = 3.664 kg carbon dioxide (CO2)
1 GtC = 3.664 billion tonnes CO2 = 3.664 GtCO2
The Global Carbon Budget and the information presented here are intended for those interested in
learning about the carbon cycle, and how human activities are changing it. The information contained
herein is provided as a public service, with the understanding that the Global Carbon Project team make
no warranties, either expressed or implied, concerning the accuracy, completeness, reliability, or
suitability of the information.
Has not gone down in 60 years
Global fossil CO2 emissions: 36.6 ± 2 GtCO2 in 2018, 61% over 1990
Projection for 2019: 36.8 ± 2 GtCO2, 0.6% higher than 2018 (range -0.2% to 1.5%)
Fossil CO2 emissions will likely be more than 4% higher in 2019 than the year of the Paris Agreement in
Global fossil CO2 emissions have risen steadily over the last decades & show no sign of peaking
Fossil CO2 emissions will likely be 62% higher in 2019 than the year of the 1st IPCC report in 1990
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The SSPs lead to a broad range in baselines (grey), with more aggressive mitigation leading to lower
temperature outcomes.
The bold lines are scenarios that will be analysed in CMIP6 and the results assessed in the IPCC AR6
Global fossil CO2 emissions are projected to rise by 0.6% in 2019 [range: -0.2% to +1.5%]
The global growth is driven by the underlying changes at the country level.
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