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  • 2025-06-11 07:19

    Unsubstantiated ‘chemtrail’ conspiracy theories lead to legislation proposed in US statehouses

    By SARA CLINE and MELISSA GOLDIN BATON ROUGE, La. (AP) — As Louisiana Rep. Kimberly Landry Coates stood before her colleagues in the state’s Legislature she warned that the bill she was presenting might “seem strange” or even crazy. Some lawmakers laughed with disbelief and others listened intently, as Coates described situations that are often noted in
  • 2023-12-03 00:27

    NASA and Boeing chase jet contrails with science of climate impact in doubt

    By  Dominic Gates  Seattle Times aerospace reporter Scientific debate is getting heated over what to do about airplane contrails — the wispy lines of water vapor you often see trailing behind a jet. Those harmless-looking vapor trails sometimes spread out to form thin cirrus clouds. Environmental activists and nonprofits focused on climate change routinely assert
  • 2023-05-06 22:23

    Contrail cirrus radiative forcing for future air traffic

    © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Contrail cirrus radiative forcing for future air traffic Lisa Bock and Ulrike Burkhardt Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany Correspondence: Lisa Bock (lisa.bock@dlr.de) Received: 14 December 2018 – Discussion started: 25 January 2019 Revised: 17 May 2019 – Accepted: 23 May 2019 – Published: 27 June 2019 Abstract. The climate impact of air traffic is to a large de- gree caused by changes in cirrus cloudiness resulting from the formation of contrails. Contrail cirrus radiative forcing is expected to increase significantly over time due to the large projected increases in air traffic. We use ECHAM5-CCMod, an atmospheric climate model with an online contrail cir- rus parameterization including a microphysical two-moment scheme, to investigate the climate impact of contrail cirrus for the year 2050. We take into account the predicted increase in air traffic volume, changes in propulsion efficiency and emissions, in particular soot emissions, and the modification of the contrail cirrus climate impact due to anthropogenic cli- mate change. Global contrail cirrus radiative forcing increases by a factor of 3 from 2006 to 2050, reaching 160 or even 180 mW m−2, which is the result of the increase in air traffic volume and a slight shift in air traffic towards higher alti- tudes. Large increases in contrail cirrus radiative forcing are expected over all of the main air traffic areas, but relative increases are largest over main air…
  • 2023-04-24 15:11

    Contrails