|Climate change is real||c) The question is meaningless|
That is correct. The question is meaningless since climate always changes. In fact, the only constant about climate is change. For example, much of North America, Europe and Asia lay buried beneath great sheets of glacial ice only 20,000 years ago. And this was only the most recent of more than 33 glaciations during the past two million years, between each of which occurred warmer ‘interglacials’, one of which we are in right now.
33 glaciations during the past two million years
More than 33 glacials followed by interglacials have occurred during current Ice House World Phase (used with permission from Professor Timothy Patterson, Carleton University, Ottawa, Canada).
The following graph shows how the interglacial just before the one we are currently in was warmer than now (in fact, two of the previous four interglacials were warmer than the today).
During last interglacial (131, 000 – 114,000 years ago), it was 3° C warmer and Hippopotamuses inhabiting Thames river, the West Antarctic ice sheet had melted and sea level was ~ 2 m higher (used with permission from Professor Timothy Patterson, Carleton University, Ottawa, Canada).
By about 15,000 years ago the Earth had warmed sufficiently to halt the advance of glaciers, and sea levels worldwide began to rise. By 8,000 years ago the land bridge across the Bering Strait was drowned (although migration to North America did not stop - the archaeological evidence shows the Inuit arrived about 6000 years ago. Their ability to cross vast tracks of open water is exemplified by their appearance off the coast of Scotland in the early 18th century. See Renée Fossett’s “In Order to Live Untroubled”.
Since the end of the Ice Age, Earth's temperature has risen approximately 9 0 C and sea levels have risen a total of 150 m. Forests have returned where once there was only ice.
Currently, we are in an "interglacial phase," or between ice ages. The question is not really if an ice age will return, but when.
The claim that the Earth has warmed 0.70C in the last 200 years is in serious doubt as it originates with Professor Phil Jones of the University of East Anglia in Norwich, UK, who refuses to disclose how he achieved the number, what stations he used or how he adjusted the data. In addition, there are virtually no instrumental records beyond 150 years and insufficient global data for the past 100 years to determine meaningful global trends. The amount of even this modest warming reduces significantly as a result of the latest corrections to the modern record.
Global cooling is a far greater threat to humanity than warming and we appear to be entering a cooling phase that is expected to continue at least to 2030. Unfortunately, world governments are preparing solely for warming.