Thirty years ago, NASA scientist James Hansen testified to Congress that the age of climate change had arrived.
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Sources

• Ashley Byrne interviews Jim Hansen for DW (published August 24, 2018) https://www.dw.com/en/worldlink-meet-mr-climate-change/av-45197919
• Hansen et al 1981 https://pubs.giss.nasa.gov/abs/ha04600x.html
• Hansen et al 1988 https://pubs.giss.nasa.gov/abs/ha02700w.html
• From the Archives, 1988: Global Warming Has Begun, Expert Tells Senate https://www.nytimes.com/interactive/projects/cp/climate/2015-paris-climate-talks/from-the-archives-1988-global-warming-has-begun-expert-tells-senate
• STUDY FINDS WARMING TREND THAT COULD RAISE SEA LEVELS (1988) https://www.nytimes.com/1981/08/22/us/study-finds-warming-trend-that-could-raise-sea-levels.html
• Bush senior remarks 1992 https://www.c-span.org/video/?26539-1/remarks-departure-rio-earth-summit
• Related Bush talk from 1992 “Environmental Issues at the Earth Summit” https://www.c-span.org/video/?26344-1/environmental-issues-earth-summit
• This Year’s Model (Peter Sinclair 2009) https://www.youtube.com/watch?v=D6Un69RMNSw
• James Hansen 1988 https://www.youtube.com/watch?v=U44y08OCrbw
• James Hansens’s Climate 1988 Predictions (Peter Sinclair interviews climate scientists, 2018 published) https://www.youtube.com/watch?v=aT-T5fxRnwk
• James Hansen’s legacy: Scientists reflect on climate change in 1988, 2018, and 2048 https://grist.org/article/james-hansens-legacy-scientists-reflect-on-climate-change-in-1988-2018-and-2048
• James Hansen https://en.wikipedia.org/wiki/James_Hansen

Additional sources

• Pixabay, Baseball players https://pixabay.com/en/videos/baseball-game-play-ball-game-19
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