Climate has always changed and always will. For most of the Earth's geological history there has been no ice at the poles.
There are many natural phenomena that can and do affect the climate; for example Solar activity, changes in the earth's orbit (e.g. Milankovich cycles), volcanic activity, ocean currents, tectonic plate movements, cosmic ray incidence (which varies as the solar system moves with respect to the interstellar medium) etc etc etc.
We have had mass extinctions, warm periods, ice ages. There have been times in the earth's history when the concentration of atmospheric CO2 has been 10 or 20 times what it is now and the earth did not suffer a catastrophe, otherwise we would not be here right now.
It seems to me that the proponents of Catastrophic Anthropogenic Global Warming (CAGW) theory are under some obligation to show that changes observed now are outside the range of variability due to non-human causes. They have not done this.
There are places where polar ice is contracting and others where it is growing and thickening. Similarly for glaciers. Decide what you want your conclusion to be and there will be some suitable piece of ice to suit you.
There is no particular correlation over geological history (extending over 100s of millions of years) between CO2 concentration and temperature. Taking just the last couple of million years there is a correlation, but increases in CO2 tend to follow temperature increases by several hundred years, not precede them, suggesting that CO2 increases are an effect rather than a cause of higher temperatures.
Over the last 2 million years the earth's climate has changed on a roughly 100-130 thousand year cycle, which correlates quite well with cycles in the earth's motion (orbit, tilt of axis, distance from sun) with ice ages lasting around 100,000 years separated by warmer and shorter interglacial periods of 10,000 -20,000 years. Since the end of the last ice age around 13,000 years ago we have been in one such interglacial. If things continue along the same lines, we should be due another ice age within the next few thousand years.
The greenhouse effect is good. If it were not present, the earth would be around 30 degrees C colder than it is. Massively the most important greenhouse gas is water vapour, not CO2. On the simplest interpretation H20 accounts for over 90% of the greenhouse effect, CO2 a few %, and various trace molecules (e.g. methane, N2O) the rest.
CO2 is good. It is plant food.
It is indeed possible that observed rises in CO2 are partly as a result of human activity. (It is not certain because there is very incomplete understanding of the various source and sinks of CO2 in the atmosphere.)
If we are causing CO2 to increase that's more likely to be a good rather than a bad thing. More CO2 means more photosynthesis so plant growth is stimulated. On the other hand is is known that if CO2 concentrations go down to, say, half what they are now then plant life really starts to struggle.
Although CO2 is considered in isolation a greeenhouse gas, there's no real evidence (and I mean real evidence, not just predictions from simplistic computer models) that it results in anything but negligible warming.
But again, suppose that's wrong and it is causing some warming. That too is more likely to be a good than a bad thing. Warmer periods in the past (e.g. holocene warming, Roman warming period, medieval warming period (900-1300 AD) have been generally good and prosperour times to be alive. Cooler periods such as the Dark Ages (500-900 AD) and the "Little Ice Age" (1300 - 1950 AD) have been terrible times to be alive (starvation, plagues etc).
We have nothing to fear from a bit of warming - much more from a cooler period.
We should stop worrying. CO2 is our friend.
