Climate Change and Sea Level – The Western Interior Seaway

My comment in today’s Times to Matt Ridley’s article seems to have sparked some debate. Here is the excellent National Geographic map of what the USA looked like during the Jurassic and Cretaceous periods (broadly speaking 200 to 66 million years before present).

You can see that much of North America is under water – a direct consequence of higher sea levels due to warmer climates.