Why are climate deniers usually anti-immigrant?

[rob in cal]

  In terms of logic, it would make sense for climate deniers to be pro-immigrants from the "hey lets grow the economy even more than it is now with lots more people, lots more consumers, lots more workers into our economy" and climate believers to say "hey wait a minute, lets slow immigration because we really don't need all this extra economic growth and activity and more fossil fuel consumption".