Labor's Ged Kearney at last night's climate debate.

Ged Kearney, Labor candidate for the Batman byelection, has refused to say that a Labor government would stop the Adani Carmichael coal mine -- even if a future Labor government had a "trigger" that would make it possible.

Kearney was speaking at a "climate-off" amid the splendid, golden Edwardian décor of the Northcote Town Hall, in the heart of Batman, with speeches and Q and A from Kearney, Greens candidate Alex Bhathal, and three minor-party candidates.