On Wednesday this week the former Green party co-leader James Shaw will address parliament as an MP for the last time. And in a moment when his party is reeling from a combination of scandal and tragedy, his valedictory marks the end of an undervalued career.  

Many of the politicians who join our so-called minor parties are idealists. They’re not like some Labour or National MPs (more than a few of whom I reckon secretly dream of becoming Prime Minister). They join because they really intensely believe in the political philosophy or kaupapa. And in the case of the Greens, it’s my view that sometimes activism comes at the expense of more pragmatic strategy.  

Ahead of his valedictory address, I went back and looked up James Shaw’s maiden speech in parliament from back in 2014.  

What stuck out to me was how much he talked about overcoming political divisions and tribalism, working together, reaching across the aisle to make connections and compromises with politicians in different parties.  

That might sound like bland political speak, but actually, politicians in New Zealand don’t talk about compromise all that much. In the U.S, Republicans and Democrats often talk about working across the aisle —even if that’s bollocks, these days— but the way New Zealand’s system is structured, usually the only compromise we see for really big legislation is between coalition or support partners in government together.  

As an MP, James Shaw did not achieve everything he wanted. Our biggest-emitting industry doesn’t pay for its emissions. Tax reform never got done. But it’s interesting to reflect on what big legacy changes have and haven’t survived the change of government.  

The Māori Health Authority, Three Waters, Auckland Light Rail, Te Pūkenga, the Oil and Gas ban; so much of the last Labour government’s policy and work programme has been scrapped.  

But one big piece of work has endured. Despite ACT’s continued opposition, the Zero Carbon Act has survived the change in government.  

Why? I’d suggest a major part of the reason is the way James Shaw went about crafting that legislation. He didn’t charge ahead by himself. He very deliberately worked across the aisle. He developed a close relationship with National’s then-climate spokesperson Todd Muller and worked to gain the support of every MP in parliament, but one. The whole purpose of the legislation was that it would survive the changing winds and ups-and-downs of politics over time. And here we are.  

I think there’s a good argument to be made that the single most significant piece of enduring legislation from Jacinda Ardern’s time in government, was a piece of work developed by an MP who wasn’t even in her party or Cabinet.  

The Zero Carbon Act is a victory for compromise. A victory for putting aside differences and uniting around common goals. And although James Shaw’s style and strategy may not have always have been appreciated by everyone in his own party, the result speaks for itself.