As I Said Elsewhere
I have no doubt natural variation can cause worse and has. The issue is that our culture and population distribution has evolved in a relatively stable climate period and that ignoring what we are doing because nature has done worse is a callous disregard for life and peoperty when we could prevent this. I also think huge past swings should rise concern that relatively moderate human induced changes could start some of these natural cycles that cause far worse swings such as release of methane hydrates.
Regards,
Mark