Proof that American right-wingers were driving SUVs in 1878

Here.

Excerpt:

After the warmest winter on record, the ice was out of Lake Minnetonka by March 11, 1878 -- the earliest date on record.

After over a century of ever-accelerating and catastrophic anthropogenic global warming, note how early the ice went out last year:

In 2007 the official ice-out for Lake Minnetonka was April 3.

Update: Official Lake Minnetonka ice-out for 2008 was April 23. Historical data is here.

Could someone please explain to me again how we know that carbon dioxide is the dominant force driving the Earth's climate?