Nigeria
is
the
world's
eighth
biggest
exporter
of
crude
oil
but
thieves
siphon
off
around
a
fifth
of
its
output
by
drilling
into
pipelines,
blasting
them
open
or
diverting
crude
at
loading
stations,
sometimes
with
the
connivance
of
security
forces,
Reuters
reported.
The
operations,
called
bunkering,
cost
Nigeria's
government
nearly
a
fifth
of
its
revenue
each
year,
Finance
Minister
Ngozi
Okonjo-Iweala
has
said.
It
is
also
a
major
cause
of
oil
spills
that
often
wreck
the
delta's
wetlands
environment.
The
Nigerian
military
paraded
Seiyifa
Gbereke,
or
General
Cairo
as
he
was
nicknamed,
in…