Much has been said about the global environmental, economic and leadership consequences of United States President Donald Trump’s decision to withdraw from the Paris climate agreement but there is also a national security dimension. Trump’s decision ignores an important development in global security centred on climate change. The US had been in a prime position to link climate to international security which, rightly or wrongly, could be leveraged for foreign policy in pursuit of climate security. The US has been a leader in climate security, an approach rivalling climate justice reasoning in climate politics. For much of the history of international climate politics, there has been a dominant discourse of climate justice. Early environmental conferences focused on planetary justice and …