Ocean level are rising, how much each year over the past many years?

Answer 1

Campbelp2002 is pretty close, but his data is a little old (from the 2001 IPCC report), and averages out all the way back to 1900, when global warming was very small.

The 2007 IPCC report says it was 1.8mm +/- 0.5 from 1961 - 2003, and 3.1mm +/- 0.7 from 1993-2003.

So a good number currently would be 4mm/year, and increasing.

Here's a page from NOAA that puts that in perspective, and offers a projection:

"The rate of sea level rise during the twentieth century has been nearly 2 mm per year, which is an order of magnitude higher than the average over the last several millennia."

http://www.cop.noaa.gov/stressors/climatechange/current/sea_level_rise.html

Answer 2

Since 1900 the level has risen at 1 to 2 millimeters per year.

Answer 3

Since the last ice age, 18,000 years ago, the ocean has risen a lot--- 140 meters.

Answer 4

Got an agenda there, Bob?

You round 3.1 +/- .7 to 4??

Sounds like you WANT it to be 4. The margin of error is just that, a margin of error. It isn't a number to be tacked on.