That curve was pretty flat until the 1950s too.

Unless you have some other numbers to show that deforestation of the U.S. eastern coast suddenly triggered major climate change after hundreds of years of European deforestation didn't.

There were about 4 million square km of forest in the U.S. before Europeans got here. Now there's about 3 million. Beware of misleading maps that only show "virgin" or "old growth" forest. Particularly since newer growth seems to be better at sinking carbon.

I'm getting tired. Let me cut to the chase:

As I see the evidence, most of the current warming is due to some natural cycle. I have seen several possible mechanisms for this. We came out of a cold snap in the early 1800s and it's been getting warmer ever since.

Temperature records in recent years are no more astonishing than having a day in June be the warmest day since January.