An environmental law professor says it wouldn't make sense to pull out of the Paris Agreement.  

Speaking to The Country, ACT Leader David Seymour's floated the idea of New Zealand leaving the agreement, suggesting it appears half the world is leaving. 

It follows US President Donald Trump pulling the United States from the climate deal. 

Waikato University's Dr Nathan Cooper told Andrew Dickens that while the US is leaving, other big players are likely to stay. 

He says climate change, which is what the Paris Agreement is there to respond to, is a global challenge. 

LISTEN ABOVE