Part of the type of events which can alter the climate besides volcanoes, which tend to erupt during solar minimum, has also been meteor impacts. It has been recently confirmed that one of the largest meteor impacts some 19 miles in diameter lies hidden beneath the glacier in Greenland. It is remarkably well preserved but exactly when the impact took place is not known. It is believed that the crater was formed less than 3 million years ago. This proves that there was no major ice at the time and the resulting depression was subsequently covered by ice. So, once again we have people claiming Global Warming will raise sea levels and focus their theories ONLY on post-Industrial Revolution. The world has not been stagnant nor has even the poles been fixed forever.