The AnswerMug Challenge Series, Philosophical Points to Ponder Edition: imagine that instead of the world being covered by a larger

Donald Trump just announced that he is going to order this done.  Right after the wall is built. 

ha ha

P.s,  As far as I know, the world has more water than land now.   You are a MARINE? And you don't know this? 

Say it isn't so.

In simplest terms, water makes up about 71% of the Earth’s surface, while the other 29% consists of continents and islands. To break the numbers down, 96.5% of all the Earth’s water is contained within the oceans as salt water, while the remaining 3.5% is freshwater lakes and frozen water locked up in glaciers and the polar ice caps. This post was edited by WM BARR . =ABSOLUTE TRASH at January 21, 2017 8:21 PM MST

With less water in the oceans it's possible that the migration of sea life onto land would take longer. With more land available to settle it's also possible that there would be less friction between groups of Neanderthals.

The lack of inter-tribal war may have slowed the development of civilisation since it would not be as critical for groups to protect themselves (by walled communities and weapons) from their friendly, hunter-gatherer neighbours.

The land bridges which once existed between Asia and North America, and between Asia and Australia. would exist to this day and would themselves be well settled. The Americas would not have their present appearance but would be a single, fairly blocky continent, extending from Canada to the Tierra del Fuego. 

The British Empire would never have existed because, with the English Channel replaced by a causeway to France, there would have been no need for British naval exploration and power.

It's possible that the additional land mass would have reflected enough of the sun's heat to avoid the ice ages and to minimise the amount of polar ice. That would turn the polar regions into temperate zones and the resultant heat in the tropical regions would boil off  whatever water remains. It would then be necessary for the entire race to build spaceships and emigrate to the planet Zorg, a Goldilocks planet in the Sirius system.

I'm too old to travel, Randy. Can't we leave the water as it is? 

With more land than water, seafood would probably be too expensive to buy. The cruise business wouldn't be as profitable, the cruises would be a lot shorter. Migration would have been a lot easier for our ancestors and we would all be more mixed than we are now. The biggest thing is there would probably be more fighting because there would be more boarders to protect.  

Something like the Tank Girl comics.

Perhaps it is an ice age. Coastal areas extend 180 kilometers further out to sea. There is less rain. All climates are colder, drier, morestable and predictable.
Small mammals have a harder time surviving and many become exctinct. Larger species thrive and proliferate. Humans herd highland cattle and other long haired livestock. Intensive livestock farming is not possible due to insufficient grain.
Agriculture is only possible in brief summer seasons and so much produce is pickled, dried or frozen.

Perhaps the use of wind and solar power enables sophisticated technologies living in ice-cave architecture and growing hydroponic food and fibres.
There are far fewer viruses and bacteria affecting health.