Because you cannot answer. If the climate, as you nuts claim, is warmer than it should be then it seems reasonable to ask how warm should it be?
Well my dear "Cranky Uncle"
It is not about "
how warm should it be" but how can human life, as billions of us currently enjoy, it be sustained?
We know that over the last hundred and twenty years there has been a massive retreat of mountain glaciers all over the world, while since the 1950s the Arctic ice has been thinning dramatically with the result that in the summer of 2000 the North Pole was ice free. It is now predicted that the Arctic ocean in summer will very likely be completely ice free before 2050.
Furthermore, the extent of Arctic sea ice in spring and summer is 10–15% smaller than it was 40 years ago, while ice on lakes and rivers at higher
altitudes in the northern hemisphere has now been recorded as melting in spring two weeks earlier than a century ago. In the early 2000s northern hemisphere spring snow cover was already 10% down on the 1966–86 mean and IPCC predictions at the time suggested that that polar and mountainous regions of the hemisphere could be 8 degrees Celsius warmer by 2100.
In 2004 the concentration of carbon dioxide in the atmosphere was 380 parts per million [ppm] and as the oceans warm they absorb more
more carbon dioxide from the air and become more acidic. Dramatically increasing the rate of melting of snow and ice means rising sea levels: tide gauge data indicate that global sea levels rose by between 10 and 20 centimetres during the twentieth century, and this rise is expected to escalate drastically in the coming hundred years, with sea levels predicted to be 40 centimetres and perhaps over 80 centimetres higher by 2100.
This year the temperatures in Greenland have been at around 15 degrees C [60 F] which is ten degrees warmer than is normal for this time of year and melting is increasing. This impacts on sea levels. For example, a 1-metre rise in sea-level would see the Maldives under water, while a combination of rising sea level and sinking of the land surface have been forecast to result in a 1.8-metre rise in Bangladesh in another thirty years or so. That would lead to the loss of 16% of the land's surface which supports millions of people.
Further temperature rises will also impact on vegetation and animal life as well as humans. At present there are some 8 billion of us on earth [unlike in the distant human past] and all those people need to be fed and housed. Hence as areas of the world become uninhabitable for humans we are going to see mass migrations of people moving to areas that are still sustainable. There will also be the risk of diseases hitherto not found in certain regions arriving as natural vectors [insects etc] move into those regions as they warm.
