There's global warming on Mars, Pluto, Neptune & its moon Triton-y do people think its SUVs causing Earth's?

See Kegwin, et al, who wrote in Science, 1996:274:1504-1508, the mean surface temp of the Sargo Sea, which was obtained by readings of isotope ratios in marine organism remains in sediment, which shows we are, today, below the three thousand year average, and far below the Medieval Climactic Optimum. E.g,, you can visit the Skaftafell Nat'l Park in Iceland, as I have, and historians know from extant deeds that somewhere around FORTY old Viking era farms are **currently** buried the Vatnajokull glacier system - i.e., it was warmer then! Y are people so close-minded on this issue? Are these the same people that think Dan Rather "really found a memo" too????