It was a refreshing reminder of how significant such activism can be in turning public opinion around, as was seen in the African American civil rights freedom rides through the Deep South in the 1960s.

However, not all were happy with Mr Brown's convoy, noting that it didn't stop over Easter.

Mr Brown's response was, quite rightly, that the issue was so urgent that the convoy could not afford to take a break.

Ironically, the urgency of the Stop Adani campaign had also been amply demonstrated by its supporters a few weeks prior when Mr Morrison's Environment Minister Melissa Price hastily approved the groundwater plans two days before the federal election was called.

Her approval was granted despite the fact that briefing notes by Geoscience Australia (GA) showed that Adani rejected advice that its groundwater modelling was "not fit for purpose".

Somehow, and this beggars belief, an additional scathing scientific assessment of Adani's groundwater plans by the CSIRO then turned into government approval of those very plans.

Given all this it needs to be explained what all the fuss is about.

Why is the advent of Adani coal mine creating such opposition?

The mine puts at risk vital water resources, including rivers and the aquifers of the Great Artesian Basin adjoining the mine, which is our greatest inland water resource, covering 22 per cent of Australia.

When built, the Adani coal mine will suck out at least 270 billion litres of groundwater over the life of the mine, put aquifers of the Great Artesian Basin at risk, dump polluted wastewater into the Carmichael River, threaten 160 wetlands that provide permanent water during drought, and leave behind six unfilled coal pits that will drain millions of litres of groundwater, forever.

But the real worry about this mine goes much further. As Bob Brown noted "Vital water and food resources would perish if this went ahead. The Murray Darling basin will be heading to 90 per cent loss of food productivity, and with that the loss of farms, livelihood and the feeling of well-being on the planet," he told reporters.

The Liberal/Nationals coalition government makes a great play of how the mine will be a major source of employment, but as world demand for coal is rapidly decreasing such a claim is certainly a furphy.

The truth is that coal has no long-term future and governments should instead focus on creating industries that give people more job security.

"If we really care about people in coal communities, we'd actually have a long-term plan for sustainable jobs in renewable energy," Australian Greens leader Richard Di Natale said.

The ALP is equivocating on its attitude to the mine.

While making praiseworthy points about its environmental dangers the party differs from the Greens in that it is not planning to ban it if the party wins government on May 18.

This is no doubt because of the jobs issue and the related need to win seats in central and northern Queensland.

The counter argument that climate change threatens more jobs on the Great Barrier Reef if the world doesn't stop mining and burning coal unfortunately doesn't seem to carry much weight.

So unless the unlikely scenario of the ALP seeking Greens support in a hung parliament results in a change of heart by Labor our only hope is the Queensland Labor government, which must sign off on the mine's management plans for the railway and also for the groundwater before construction can begin.

Unfortunately, the Queensland ALP is beset by the same conundrums as its federal counterpoint.

All of which brings me back to my starting point of the need for activism. If enough citizens made it clear that they would not vote for a party supporting the mine then it would not go ahead, as politicians would need to listen.

It's time to take to the streets, engage with social media and of course also join Stop Adani Wagga before we all head to the ballot box.