A Queensland farmer has cut a giant message in his field to urge G20 organisers to add climate change to the agenda for this month's leaders' summit.

Rob McCreath said he was prompted to take action after Brisbane Airport rejected a billboard calling for climate change to be put on the G20 agenda.

He ploughed the message "Go Solar" into a field on his property at Felton, south of Toowoomba.

"I hope [German chancellor] Angela Merkel shirt-fronts Tony Abbott and asks him, 'If Germany can go solar then why on earth can?t Australia?'," Mr McCreath said.

He said farmers were at the "pointy end" of climate change.

"Last year was our hottest on record, this one's shaping up to be even worse, and we've got a raging drought over a vast area," he said.

"In spite of the overwhelming scientific evidence, our idiotic politicians are hooked on coal and gas, which is the cause of the problem.

"We have huge reserves of sunshine, so making use of it is simply a matter of common sense.

"Our Government's reluctance to do so is an international embarrassment.

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