Because it won't (Obama to open offshore areas ...):
The Obama administration is proposing to open vast expanses of water along the Atlantic coastline, the eastern Gulf of Mexico and the north coast of Alaska to oil and natural gas drilling, much of it for the first time, officials said Tuesday [ed: new areas in red to the right].The proposal — a compromise that will please oil companies and domestic drilling advocates but anger some residents of affected states and many environmental organizations — would end a longstanding moratorium on oil exploration along the East Coast from the northern tip of Delaware to the central coast of Florida, covering 167 million acres of ocean. ...
The proposal is intended to reduce dependence on oil imports, generate revenue from the sale of offshore leases and help win political support for comprehensive energy and climate legislation. ...
But even as Mr. Obama curries favors with pro-drilling interests, he risks a backlash from some coastal governors, senators and environmental advocates, who say that the relatively small amounts of oil to be gained in the offshore areas are not worth the environmental risks. ...
In many of the newly opened areas, drilling would begin only after the completion of geologic studies, environmental impact statements, court challenges and public lease sales. Much of the oil and gas may not be recoverable at current prices and may be prohibitively expensive even if oil prices spike as they did in the summer of 2008.
Here is what I concluded back in September 2008:
... the net benefits of offshore drilling are way, way positive (even considering climate change) so the official Environmental Economics blog position is in favor.