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"Henig lays out the ethical and political battlefield of the 1970s - a battlefield that is recreated with each new technology - and traces the sea change that has occurred in the public perception of 'test tube babies'."
Why "sea" change? Does it simply mean "big" change?
"Henig lays out the ethical and political battlefield of the 1970s - a battlefield that is recreated with each new technology - and traces the sea change that has occurred in the public perception of 'test tube babies'."
Why "sea" change? Does it simply mean "big" change?
yes, it does. It's a major, significant, marked transformation.
sea change? 
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