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The Vostok ice core provides us with much information.
For example, here is the carbon dioxide concentration versus temperature record for the last 420,000 years;
The carbon dioxide concentration is in parts per million (ppm).
The temperature is in degrees centigrade.
The graph shows that if the 420,000 year trend continues, we are in for a massive temperature rise.
Indeed, this rise in temperature is already under way, as is verified by the following data from the National Oceanic and Atmospheric Administration (NOAA).
The anomalies measure the difference from the 20th century average (1901-2000).
The 20th century average land+ocean surface temperature is 13.9 °C.
The 20th century average land surface temperature is 8.5 °C.
The 20th century average ocean surface temperature is 16.1 °C.
Data from : ncdc.noaa.gov/monitoring-references/faq/anomalies.php
For a full listing of the 137 years of these temperature records, see:
The rise in average yearly land temperatures is particularly worrying (from 7.8725 °C in 1884, to 9.9357 °C in 2017).
So, why is the rise in temperatures so worrisome?
For one thing, as temperatures rise good farmland will become desert (e.g., dust-bowl conditions will probably return to the American Midwest).
Another major problem is sea-level rise.
Have a look at http://pubs.usgs.gov/fs/fs2-00/
The U.S. Geological Survey people claim that;
The Greenland ice sheet melting will raise sea-level 6.55 meters (21.5 feet),
the West Antarctica ice sheet melting will raise sea-level 8.06 meters (26.4 feet),
the East Antarctica ice sheet melting will raise sea-level 64.8 meters (212.6 feet),
and all other ice melting will raise sea-level 0.91 meters (3 feet).
For a grand total of 80.32 meters (263.5 feet).
So, what does an 80 meter (263 feet) rise in sea-level mean. Have a look at the following map of the world after an 80 meter rise.
For a larger map see: http://www.preearth.net/images/after-melt-world.png
It means that over one billion people will have to be resettled to higher ground and that the much of the most productive agricultural land will be under water. Fortunately, at current rates the Greenland ice sheet will take over a thousand years to melt and the Antarctica ice sheet much longer. However, the greater the temperature rise the faster the ice sheets will melt, bringing the problem much closer. Remember, the huge ice sheet that recently covered much of North America, almost completely melted in only 15,000 years (only the Greenland ice sheet and some other small patches remain). Since then (15,000 years ago), sea-levels have risen about 125 meters (410 feet), only 80 meters to go.
This is what Britain and Ireland will look like: