One Nation senator Malcolm Roberts is yet to be convinced that climate change is real and is caused by humans.

He has asked chief scientist Dr Alan Finkel to spell out his logic in asserting that human-induced carbon emissions have been rising since the start of the Industrial Age, that this causes global warming and that warming produces climate change.

Senator Roberts told a Senate committee on Thursday his requested summary of the logic and the empirical evidence behind climate change did not need to be long.

"Like me - short and simple," he said.