You can read more about this action and how a cardboard sign can force climate change onto the campaign trail here. (350.org)
Two widely used statistical approaches to reconstructing past climate histories from climate «proxy» data such as tree - rings, corals, and ice cores, are investigated using synthetic «pseudoproxy» data derived from a simulation of forced climate changes over the past 1200 years. (mustelid.blogspot.ru)
We conclude at this point that (i) several differently characterized methods should be applied and discussed simultaneously, (ii) uncertainties should be taken into account to prevent biased or wrong conclusions, and (iii) removing internally generated climate variability by incorporating atmospheric or oceanographic information helps to uncover externally forced climate change signals. (kaltesonne.de)