This chart shows the relative changes in global average temperature, CO2 (carbon dioxide), and sea level over the last 420,000 years. The data is derived from different sources that corroborate and confirm the findings. Data sources include air bubbles trapped in layers of the ice sheets in Greenland and Antarctica; isotopes of oxygen that are temperature markers; isotope markers of diverse elements in layers of deep ocean sediments; ancient coral reefs and speleothems; salt marsh core samples; and physical evidence of ancient shorelines, above and below the present.
One would think that sea level would be the same height everywhere, if we eliminated the waves and the high/low tide variation. We would be wrong; very wrong. I must admit that as I have researched my book about risng sea level, that was one of the most surprising things I came to understand. I knew there were some variations, but had no idea how great they were.
Rising Sea level is one of the main concerns about a warming planet. You would think it would be simple: the ice melts; the sea rises.
Just a few months ago, the Vatican's Pontifical Academy of Sciences published a paper in which it assessed climate change and what mankind should 
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