This article is from the Prophecies of Nostradamus FAQ, by firstname.lastname@example.org.
I p 170 (cIV-67)
A very bright, previously unknown comet will appear and coincide with
the time of great geological troubles, with earthquakes and volcanoes
erupting and disrupting weather systems. This will cause widespread
famines and droughts, and social upheavals in unexpected places.
Nations that are considered prosperous and powerful, particularly
western nations, will be weakened. They will be torn with civil
strife and rioting as people migrate to areas that have water and
can support crop-growing. The social upheaval and weakening of
political structures will help the Antichrist come to power.
I p 167 (cVIII-29)
A great and rich power will be subject to serious natural disasters,
particularly earthquakes and flooding, and rend the nation from end
to end, causing enormous conflict, despair, and misery. The wealthy
power will be bankrupted attempting to deal with its disasters.
Three other great nations will send aid to help the citizens survive.
Earth changes will take place that will help the Antichrist's drive
for world conquest. In central Europe, southern Europe, and in the
Near East, particularly around the eastern end of the Mediterranean,
there'll be severe floods. As a result of the disruption to local
governments by the natural disasters, the Antichrist will move his
troops in under the disguise of helping the people restore civil
order, but really use this as a device to take over countries, and to
use the populations like slaves.
Serious economic problems will persist along with great social unrest,
contributing to the ease with which the Antichrist can seize power.
The frightened and hopeful populace will be vulnerable to his
demagoguery. The Antichrist will use the disasters as opportunities
to overthrow governments and sneak spies into a country. Martial law
will be declared in many areas to stop rioting and looting. The
Middle East, the source of his power, will not be as devastated as
the rest of the world. He offers assistance to other countries trying
to recover but he will eventually stab them in the back.