Hansen 2017: Young people's burden: requirement of negative CO₂ emissions

James Hansen et al. published a paper about the expected costs due to climate change, aptly named "Young people's burden".

Young people's burden: requirement of negative CO2 emissions

Temperature anomalies
(Hansen et al. 2017, License: cc-by)

The paper builds on a previous paper by Hansen et al. (2016) which I summarized in Hansen 2016 got through peer-review — “Ice melt, sea level rise and superstorms”. Hansen 2016 ends with many questions which need to be addressed.

Hansen 2017 says in the abstract:

We show that global temperature has risen well out of the Holocene range and Earth is now as warm as it was during the prior (Eemian) interglacial period, when sea level reached 6–9 m higher than today. Further, Earth is out of energy balance with present atmospheric composition, implying that more warming is in the pipeline, and we show that the growth rate of greenhouse gas climate forcing has accelerated markedly in the past decade.

In short: We knew for 35 years that this is coming,1 and we failed at stopping it. Now we have to fight hard to avoid the worst of the expected fallout.

However it keeps a sliver of hope to avoid the global chaos which would be likely to ensue when most coastal cities would become flooded and hundreds of millions of people would need to relocate:

Keeping warming to less than 1.5 °C or CO₂ below 350 ppm now requires extraction of CO₂ from the air. If rapid phaseout of fossil fuel emissions begins soon, most extraction can be via improved agricultural and forestry practices.

All the details are available in Hansen, J., Sato, M., Kharecha, P., von Schuckmann, K., Beerling, D. J., Cao, J., Marcott, S., Masson-Delmotte, V., Prather, M. J., Rohling, E. J., Shakun, J., Smith, P., Lacis, A., Russell, G., and Ruedy, R.: Young people's burden: requirement of negative CO2 emissions, Earth Syst. Dynam., 8, 577-616, https://doi.org/10.5194/esd-8-577-2017, 2017

  1. Climate Impact of Increasing Atmospheric Carbon Dioxide J. Hansen, D. Johnson, A. Lacis, S. Lebedeff, P. Lee, D. Rind, G. Russell, NASA Institute for Space Studies, Goddard Space Flight Center, 1981. Abstract: The global temperature rose by 0.2°C between the middle 1960's and 1980, yielding a warming of 0.4°C in the past century. This temperature increase is consistent with the calculated greenhouse effect due to measured increases of atmospheric carbon dioxide. Variations of volcanic aerosols and possibly solar luminosity appear to be primary causes of observed fluctuations about the mean trend of increasing temperature. It is shown that the anthropogenic carbon dioxide warming should emerge from the noise level of natural climate variability by the end of the century, and there is a high probability of warming in the 1980's. Potential effects on climate in the 21st century include the creation of drought-prone regions in North America and central Asia as part of a shifting of climatic zones, erosion of the West Antarctic ice sheet with a consequent worldwide rise in sea level, and opening of the fabled Northwest Passage. 

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