The question of "Why Seven Meters" is a really good one. And there is a good answer for this. But the answer requires some preliminary work. Sea level changes every century as climate conditions change. After an ice age, sea level will rise as the glaciers shrink. As another ice age grows, sea level will fall as water is captured on the continents. Between ice ages, continents rise as well when released from the weight of thousands of feet of ice. Without human intervention, we would likely see the trend of slow sea level rise continue as it has for centuries.
What IS lightblueline:
Lightblueline is a volunteer public education effort that transforms the science of global climate change into a public action. We are painting the seven meter above sea level line on the streets of the world to remind everyone that human induced climate change will, if we do not act NOW, create a new climate, and a new coast line. We chose seven meters, as this is the effect of the ice on Greenland (only) melting.
Louis Gray at the Telegraph (UK) reports on recent findings from scientists studying Greenland. Ice sheet in Greenland melting at record rate
Here is an excerpt from the report:
"The Greenland ice sheet is melting at a record rate due to global warming, according to a British-led expedition currently taking measurements from the treacherous glaciers.
NOAA has released the "State of the Climate" report for 2009. It was a warm year.
State of the Climate
Here is the beginning of the abstract:
The National Academy of Sciences has begun to issue reports on national priorities in response to global climate change. These reports are housed on a new website called America's Climate Choices .
May 19, 2010
STRONG EVIDENCE ON CLIMATE CHANGE UNDERSCORES NEED
FOR ACTIONS TO REDUCE EMISSIONS AND BEGIN ADAPTING TO IMPACTS
Wired News reports on Jim Titus's data, which show the vulnerability of Eastern US beaches to even small amounts of sea-level rise. (Jim has been providing EPA data for the Lightblueline effort).
You can read the whole article on the Wired site: EPA Scientist Says East Coast Beaches Threatened by Sea Level, But Nobody’s Listening
Here is an excerpt:
In Santa Barbara, you can walk on seaside sidewalk and look up to see ribbons marking the 7 meter elevation above your head. These ribbons and the associated information being handed out this week are the work of a group of students at Santa Barbara High School.
Their website describes their work:
The Los Angeles Times (March 12, 2009, Margot Roosevelt reporting)
The initial results of the Governor's project to inform coastal areas about potential vulnerability to sea-level rise are beginning to arrive.
Here is an excerpt from the LA Times article:
"California's interagency Climate Action Team on Wednesday issued the first of 40 reports on impacts and adaptation, outlining what the state's residents must do to deal with the floods, erosion and other effects expected from rising sea levels.
The New York Times (March 13, 2009) reports from Climatewire (JEAN-MARIE MACABREY reporting) the results of the special IPCC meeting in Copenhagen.
Here is an excerpt:
"Scientists are gloomy; economists are more upbeat. Such was the bottom line of an epic, three-day international congress of climate change experts that ended here yesterday.
Source: University of Copenhagen March 10, 2009
"Research presented today at the International Scientific Congress on Climate Change in Copenhagen shows that the upper range of sea level rise by 2100 could be in the range of about one meter, or possibly more. In the lower end of the spectrum it looks increasingly unlikely that sea level rise will be much less than 50 cm by 2100. This means that if emissions of greenhouse gases is not reduced quickly and substantially, even the best case scenario will hit low lying coastal areas housing one in ten humans on the planet hard.