What if the great lakes dried up?

They apparently have in the past, but not completely. This site (9:30 mark) mentions 50 meters (155 feet) drop from current levels into several independent basins, which to the evidence levels could only happen with severe drying and drought. read more

If all the Great Lakes dried up, the climate would be such that North America would be an extremely arid desert from central Canada to the southern tip of Texas and from Boston to LA. Keep in mind that the Great Lakes is fully 25% of the fresh water supply of the Earth. read more

Over the past decade, alarmists have repeatedly made claims that the Great Lakes were drying up. However, month after month Great Lakes water levels were higher in the 2000s than low level records set in previous decades. Humans have only been keeping consistent Great Lakes water level records for 94 years. read more

If all the Great Lakes dried up, the climate would be such that North America would be an extremely arid desert from central Canada to the southern tip of Texas and from Boston to LA. Keep in mind that the Great Lakes is fully 25% of the fresh water supply of the Earth. It feeds and is fed by roughly 75% of the river systems in North America. read more