This letter is full of hogwash. Galileo wasn't under house arrest because he went against the "scientific" community. He went against the church and the Bible.

And then this gem: "So let us be skeptical of scientists who receive grants to prove the existence of global warming . . ." Science doesn't 'prove' anything. It either reinforces or refutes hypotheses and a hypothesis can be replaced with one that does a better job of explaining the data. 

Do you, Dale, have a better hypothesis to explain the changes we can measure in our climate? If so, what is it? Where's the data supporting your hypothesis? Engage in the scientific process. We're waiting.