What puzzles me though is why farmers are wasting their time trying to persuade Barnaby Joyce to take meaningful action on climate change, or why they bother with the National party at all.

The Nationals have clearly demonstrated that they support coal miners above farmers, and Barnaby appears not for turning on anything to do with climate action. Farmers' energies would be far better spent supporting Greens candidates at all levels of government where they would find exactly the sorts of policies that they are hoping to get from the Nationals. Former Nationals leader Michael McCormack has frequently tried to discredit the Greens, describing them as inner-city latte drinking, woke and out of touch, but the truth is rather different. Greens are certainly much better advocates for farmers than the Nationals will ever be.

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Correspondent Robert T Walker ("'Nothing to do with humans'", June 22) has provided a short lesson on the history of climate change on the planet and tells us none of the past events, nor the present event, has been induced by human activity.

He says that past events are provable. Briefly a climate change event (past or present) is due to Earth's climate alternating between ice ages and greenhouse periods.

Both of his hypothesis are absolutely correct, excepting the current event. This is confirmed by long term research by glaciologists and geologists i.e. scientists. So he is on the side of the scientists on this aspect of climate change.

There have been five major ice age events in Earth's history. Mr Walker is correct in that none of these events were caused by humans, but only because humans did not exist at the time these events occurred and could not possibly be responsible. It is established scientific fact that these events were natural. So what is the lesson here?

Like a lot of climate change deniers he is possessed of limited detail overall, which is most likely hindering his understanding of the present event. Mr Walker falls into that category of sceptic who do not understand evidence-based science and are simply uninformed and misinformed and make such ignorant statements like "its just a theory" or "we've had climate change before" and whose ignorance sidelines them from the climate debate.

The return of Barnaby Joyce as Nationals leader is going to be a climate problem for Prime Minister Morrison and the Liberals. After all, the recent Lowy Institute's Climate Poll showed 78 per cent of Australians wanted a net-zero emissions target for 2050.

Yet the climate denying Nationals consistently demand they want no targets for action on climate. The Liberal Party needs to be careful not to risk getting rejected from highly concerned climate voters from both regional and suburban seats in the next federal election. There are many of us, myself included, who will cast our votes in the ballot box for the party with the strongest action plan on climate.

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