Talkback radio host Alan Jones has told political group GetUp to "get stuffed" as it pursues a complaint against him with the broadcasting watchdog.

The Australian Communications and Media Authority (ACMA) has been asked to investigate comments about man-made carbon dioxide that Jones allegedly made in March while broadcasting his popular morning program on Sydney's 2GB station.

GetUp said it complained to ACMA because Jones said human beings produce 0.001 per cent of carbon dioxide in the air.

Jones today denied ever having made the comment and said the complaint was politically motivated.

"I never said that at all," he said.