# re : global warming **URL:** \ **Category:** Factual Questions\ **Created:** [June 28, 2014, 10:15pm UTC](https://boards.straightdope.com/t/re-global-warming/691890 "2014-06-28T22:15:28Z")\ **Posts on this page:** 5\ **Page:** 2
**Author:** ![watchwolf49](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@watchwolf49](https://boards.straightdope.com/u/watchwolf49)\ **Post date:** [July 24, 2014, 12:18pm UTC](https://boards.straightdope.com/t/re-global-warming/691890/21 "2014-07-24T12:18:23Z")
Another factor is land mass rebound … as the ice melts of Greenland and Antarctica, these landmasses start rising. Although sea level measured there is lowering, it would raise sea levels elsewhere. But as above, melted ice from the land and thermal expansion of the water are the major contributors. ---
**Author:** ![md2000](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@md2000](https://boards.straightdope.com/u/md2000)\ **Post date:** [July 24, 2014, 1:05pm UTC](https://boards.straightdope.com/t/re-global-warming/691890/22 "2014-07-24T13:05:55Z")
> [@Exapno\_Mapcase](#): > > All no doubt true. But I was responding to the claim that the weight of big cities pushes down the land. I continue to reject that it’s at all significant. Is that not correct? The problem with Venice periodically flooding, for example, was determined to be subsidence due to excessive ground water pumped out of the underlying rock in Mestre (on shore) and the surrounding area. The government stopped that about 20 or 30 years ago and apparently the subsidence has stopped. I’m not aware that water was pumped into wells to recover oil, except recently toward the very end of life of some oil fields, and now very recently as a fracking tactic. IIRC traditional oil fields, the oil is trapped under rock or salt domes and is under pressure, so much so that some oil fields were the traditional “gushers” when drilled into. My guess would be there would be more surface subsidence that displacement with water. Any non-deliberate water replacement would likely be re-balance of the existing water table? ---
**Author:** ![Exapno\_Mapcase](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/exapno_mapcase/32/1051_2.png) [@Exapno\_Mapcase](https://boards.straightdope.com/u/Exapno_Mapcase)\ **Post date:** [July 24, 2014, 4:49pm UTC](https://boards.straightdope.com/t/re-global-warming/691890/23 "2014-07-24T16:49:06Z")
> [@md2000](#): > > The problem with Venice periodically flooding, for example, was determined to be subsidence due to excessive ground water pumped out of the underlying rock in Mestre (on shore) and the surrounding area. The government stopped that about 20 or 30 years ago and apparently the subsidence has stopped. I wonder why I bothered writing “Almost all land subsidence **in the U.S.** comes from the removal of groundwater.” if no one is going to bother reading it. ---
**Author:** ![enipla](https://avatars.discourse-cdn.com/v4/letter/e/54ee81/32.png) [@enipla](https://boards.straightdope.com/u/enipla)\ **Post date:** [July 24, 2014, 5:24pm UTC](https://boards.straightdope.com/t/re-global-warming/691890/24 "2014-07-24T17:24:03Z")
Very interesting graphic showing the amount of water in the world - I’ll bet it surprises some folks. > **[Where is Earth's Water? | U.S. Geological Survey](https://www.usgs.gov/special-topics/water-science-school/science/where-earths-water)** > > "Water, Water, Everywhere..."  You've heard the phrase, and for water, it really is true. Earth's water is (almost) everywhere: above the Earth in the air and clouds and on the surface of the Earth in rivers, oceans, ice, plants, and in living... ---
**Author:** ![Dewey\_Finn](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dewey_finn/32/4222_2.png) [@Dewey\_Finn](https://boards.straightdope.com/u/Dewey_Finn)\ **Post date:** [July 24, 2014, 6:06pm UTC](https://boards.straightdope.com/t/re-global-warming/691890/25 "2014-07-24T18:06:12Z")
> [@Exapno\_Mapcase](#): > > Almost all land subsidence in the U.S. comes from the removal of groundwater. The weight of buildings is comparatively trivial. In NYC, in fact, it’s negative - skyscrapers weigh less than the amount of rock removed to create their foundations. Another thing is that many of the skyscrapers in Manhattan rest on bedrock, which is hundreds of feet thick. [Previous page](https://boards.straightdope.com/t/re-global-warming/691890.md?page=1)