As mentioned previously, I don't really care whether or not man-made climate change is true or not, and I don't seek to disprove your side, but some parts of your stance against it are kind of...well...off the charts.
1) [SEA ICE]
a. Al Gore's 'documentary' [...]
He wasn't talking about Al Gore or SEA ice, but GLACIAL ice on land. Your whole deal about sea ice didn't address anything.
2) [PERMAFROST]
[...]
b. The claim that warming will cause CO2+Methane release does not support the Thermageddonist's claim that warming is due to Man.
Of course the aforementioned claim doesn't support the claim that warming is because of mankind. Of course not. You just presupposed that man-made climate change (or one of the mechanisms behind it) is false just to make this point. It's like if I burned your house down and said that there wasn't enough water present to dowse the flames, so it must not be humid outside. While the humidity (or lack thereof) could have an impact on the house burning, it clearly didn't matter since the house burned anyway.
3) [GLOBAL TEMPERATURE GRAPH]
b. The data are being systematically corrupted.
Lol...I know you were quoting the article, but knowing of how you post, I'm honestly surprised you didn't say "systemically."
The article using the word wrong and you quoting them anyway is a real possibility though.
c. If overall average temperatures are indeed rising, this is not proof of the claim that it is man-made.
Not by itself, anyway. It tells us nothing without context. A "why," if you will. As in, why are you so vehemently against the idea of man-made climate change if you never present an alternative to deal with the issues it stems from?
d. If (returning out of the little ice age) average temperatures rise, this is not a-priori harmful to human life. There are more reasons than not to expect this will be good for human flourishing.
What a great way to explain your position. Global warming might be good for the human population because reasons.
You are aware that the commonly-accepted reasons behind man-made climate change derive from a root issue that causes other problems, right? Heavy dependence on finite resources? Pollution? Geopolitics involving said finite resources? Human activity that's considered to contribute to global warming also potentially being a bee killer? How is any of that good for humanity?
Lemme guess. We'll just collectively "suck it up" and move on, right?
e. The temperature graph you showed only shows a century - an insignificant blip in geologic time. Perspective can be gained looking at proxy results from tens of thousands, hundreds of thousands or hundreds of millions of years.
Non-sequitur. You're implying humans can't be behind climate change today because the climate changed before. And, hey, would you look at that...rapid fluctuations in CO2 levels appear to correspond with rapid fluctuations in global temps, and stable CO2 levels with stable temps.
See what I did there? I can interpret what I want from the graph, just like you did.
Speaking of, you've been making an awfully big fuss over CO2 itself. There are other gases that can exacerbate the "greenhouse effect," some of which are of great significance, if not equally so, despite being less common than CO2. Such as methane. Such as NOx gases. CFCs and HFCs. Why not go after them?
b. Sea levels have always changed and changing sea levels are not evidence or proof that human activity caused them.
Lol you just did it again. Of course the sea levels changing isn't proof in and of itself that humans did it, but just because it happened before humans doesn't mean it can't happen because of humans.
Also, I will bring this up again since you didn't address it the first time. There's ice on land, which has stayed on land since humans have been around, that is separate from the liquid water in the oceans, and is thus not displacing the ocean's waters. Reckon what happens if that land ice were to slip into the sea?
c. Estimating sea level rise is also difficult. Land in various areas rises and sinks, and sea levels change locally.
So are you saying that you can't understand how modern scientists can account for those variables to get an accurate measurement of the sea level? If you are, then that presents two issues:
-you're arguing from incredulity; and
-the webpage you cite to make this point relies on those same types of readings to come to the conclusion the author drew, so why isn't the same amount of skepticism thrown his way?
I hope I could share some insight into why your post did not defend Al Gore's 20-foot claim[...]
You did not share any such insight for the simple reason that his post wasn't defending Al Gore's claim to begin with.