-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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