-010-9816-7, Figs. 1&3
North American droughts
last 1200 years
Cook et al. JQS 2010, 25(1), p.48-61, Figs. 4&7
Volcanic aerosols
Changing solar radiation
Changing greenhouse gas
concentrat ions – natural and
human
Anthropogenic and natural
emissions of aerosols
Changed land use
Internal dynamics
IPCC 2007, Fig. 6.13
Reasons behind the changes
Mann et al. Science 2009, 326, p.1257, Fig. 1
Past
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