Probably a a good time to remember that nickb = pg (http://news.ycombinator.com/item?id=152361), which also explains the spate of climate change denialism which swamps this otherwise largely sane site (http://news.ycombinator.com/item?id=242215).
There is a whole raft of evidence showing that co2 is released because the earth is hotter. There's evidence to show the 'green house effect' doesn't really do much. There's evidence to show direct correlation between sunspots, and the temperature on earth.
To label people 'denialists' and 'intelectually lazy' is offensive. Of course we shouldn't use so much oil. We should be more efficient. But the reasons for blaming humanity for global warming are shady. More to do with money and power, and oppressing the third world.
The "Global warming is caused by man" theory has turned into a religion instead of actually looking at the latest available evidence to make an informed decision. that is intelectually lazy.
Unless you really think pg would have gone to the trouble of accessing his sock puppet account to congratulate himself and Jessica on their wedding day [http://news.ycombinator.com/item?id=205946].