Start with tide
gauge records.
The example below,
is from a tide gauge
mounted on
solid bedrock,
on the southern tip
of Manhattan:
Manhattan
tide gauge
sea level
data go
back to
the 1850s.
There's no
obvious
acceleration
of sea level rise
since then,
that could be
blamed on
global warming.
Global warming
after 1975 seems
to have had
no effect on the
170+ year, gradually
rising sea level trend.
If you are a
climate alarmist,
that reality is
disappointing !
You need some
science fraud
to support your
60+ years of
climate change
scaremongering !
So you cherry pick
a start point -- a year
with below average
sea level rise.
1980 works.
Ignore the 130
years of data,
from 1850
to 1980 !
And then
extrapolate
sea level rise
by using only
40 years of data,
and a
cherry picked
starting year,
as shown in
the chart below: