(1) The future climate is claimed to be "known" with great certainty … but,
(2) The past climate is constantly "changing", due to frequent, unnecessary data "adjustments" … and almost every unpublicized "adjustment" creates more global "warming" !
(3) Climate modelers remain consistently "certain" about the predictions of their computer games, even as 97% of their past climate predictions have overestimated actual warming, usually by a huge margin, and
(4) Between false predictions of a coming climate crisis, which started in the 1970s, government bureaucrats at NASA and NOAA are repeatedly "revising" their surface temperature data from the past !
The main problem with climate models, beyond their wrong predictions, is that computer models are not data.
And without data, there is no science -- just wild guess speculation about the future !
And with no climate models, there would be no coming climate change catastrophe claims.
No honest person could review the rough estimates of Earth's average temperature from 1880 to 2015, and then claim the small change since 1880 was "abnormal" for our planet (+1.5 degrees F., +/- 1.0 degrees) .
I'm being very optimistic by guessing the unknown margin of error is only +/- 1 degree F. -- but most thermometers in the 1800s read low, and coverage was far from global, so the warming since 1880 is almost certainly over-estimated.
Predictions of the future, with no data, are climate astrology, not science !
Climate models deceive people mainly because these computer games are controlled by government-subsidized PhDs, who present long-winded reports, using technical words and complex math, that impress the average person.
The average person has no idea climate model predictions are really nothing more than the personal opinions of the small group of people who control the computer model assumptions.
The frequently used rough estimate of Earth's average temperature is probably irrelevant on a planet like ours where the climate is constantly changing.
No one lives in the average temperature, and no one should care about the average temperature.
Ordinary people may care about significant changes to the climate where they live and work.
Americans, for example, might care about the average temperature of their state.
Few Americans realize the average temperature of the 48 contiguous US states actually declined from 2005 to 2015, even after lots of "adjustments" trying to change the trend ( perhaps a few more years of "adjustments" are needed before smarmy bureaucrats finally change that cooling trend to a warming trend ! )
Few Americans realize 47 of those 48 states had their hottest year on record BEFORE the year 2000 -- often in the 1930's, or in 1998 !
Many Americans in those 47 states may think global warming is affecting them … without knowing they've experienced no warming in over ten years.
Complaints about a very cold 2013 - 2014 winter, however, would be justified.
Past and present state and local temperature data are useful to know, but wild guesses of Earth's average temperature 100 years in the future are worthless.
Whether Earth is cooling or warming actually depends on the starting and ending points of the time period being examined:
Earth cooled a lot since the Greenhouse Ages.
Earth warmed a lot in the past 15,000 years.
Earth warmed slightly since 1850.
Earth cooled slightly since 1998.
Average temperature is always changing.
Earth is always getting warmer or cooler.
So what ?
The debates about very rough estimates of the average temperature are irrelevant.
Those debates almost always focus on a mere 0.001% of our planet's history -- the 135 years from 1880 to 2015.
The average temperature measurements are very rough -- practically wild guesses in the 1800s.
A mere 135 years of data tell us almost nothing of value about the climate of a 4.5 billion year-old planet.
In Earth's history, huge ice sheets have come and gone several times, with scientists still not sure why.
We do know 15,000 years ago one or two miles of ice covered my home state of Michigan, and then warming started … and it was not started by coal power plants and SUVs emitting CO2 15,000 years ago.
There's no logical reason to assume 4.5 billion years of natural climate changes suddenly stopped in the mid-1970s, and for no known reason manmade CO2 magically became the "temperature controller."
But you MUST believe that fantasy to be a member of the coming climate change catastrophe cult.
Temperature changes of a few tenths of a degree are debated, yet such small changes are likely to be measurement errors, or random variations of no importance.
A more interesting debate would be on whether most people would prefer warming or cooling -- I think most people in Michigan would prefer warming, while most people in Nevada would probably prefer cooling.
No one knows what Earth's "normal" climate is, or if there is a "normal" climate.
Average temperature charts are usually designed to make tiny +/- 0.1 degree temperature changes look HUGE.
With a vertical range of only one degree or two, the charts show tiny anomalies versus the average temperature in a prior period -- often a 30-year average.
Those charts grossly exaggerate the importance of tiny one-tenth of a degree changes of the average temperature -- that's bad science, but good climate scare propaganda.
More CO2 in the air is good news for accelerating the growth rate of green plants, for the benefit of the animals and people who eat them.
If CO2 increasing beyond current levels causes measurable warming, which is an unproven theory, then it will do so mainly at night, and mainly in the coldest areas of our planet.
Greenhouse warming mainly makes winter nights warmer for people who live in cold climates -- and that change would be welcomed by the few people who live in those areas.
In fact, a slightly warming Earth is good news for everyone.
Don't most people prefer to take their vacations in warmer climates?