Comments 1 to 6:

1. uncletimrob at 18:01 PM on 8 May, 2015

   Thank you!  Another keeper for my students.  Most inforative and easy to understand.

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2. Brendon at 22:51 PM on 8 May, 2015

   Thanks, Katharine's a great communicator.

   Out of interest, any idea where the source is for the 26,500 indicators of warming?

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3. Daniel J. Andrews at 07:08 AM on 9 May, 2015

   Brendon, I think the paper for that is Attributing physical and biological impacts to antrhopogenic climate change by Rosenzweig et al in Nature May 15, 2008 (vol 453). They examined 29,500 biological indicators and 90% of them were in the direction expected from global warming. That gives 26,550 indicators of warming.  

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   Moderator Response:

   [DB] Added link to a full copy of the paper.

4. SirCharles at 23:59 PM on 9 May, 2015

   Video by the US National Academies of Sciences:

   Read more in "Climate Change: Evidence and Causes"

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   Moderator Response:

   [RH] Reduced size to fit page formatting.

5. anticorncob6 at 10:38 AM on 15 May, 2015

   Why doesn't her graph around 10:30 in the video show the medieval warming period as clearly as other graphs I have seen?

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6. Rob Honeycutt at 11:17 AM on 15 May, 2015

   anticorncob6... Because you're looking at a reconstruction of the holocene (the past 10,000 years) and the MWP was only about 800-1200 years ago.

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