Comma or not?

Should there be a comma between "complicated" and "thanks"? "As you can surely tell, air travel is becoming more complicated, thanks to climate change." -OR- "As you can surely tell, air travel is becoming more complicated thanks to climate change." I was typing up a... show more Should there be a comma between "complicated" and "thanks"?

"As you can surely tell, air travel is becoming more complicated, thanks to climate change."

-OR-

"As you can surely tell, air travel is becoming more complicated thanks to climate change."

I was typing up a handwritten essay my teacher has already graded and in which I had NOT put a comma. I found this and thought there SHOULD be a comma and that I had forgotten it, but either my teacher thought it was correct or didn't notice. Certain answers only please.
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