Representatives from nearly 60 nations are meeting in Colombia this week outside the formal U.N. process to discuss the transition to clean energy.

The gathering, led by Colombia and the Netherlands, does not include the U.S. It comes amid a historic global fuel price shock, with the U.S.-Israeli war against Iran exposing the vulnerability of the Strait of Hormuz as a transportation bottleneck for about a fifth of the world’s oil and gas supplies.

The summit is expected to include other larger fossil fuel producers, such as Australia, Brazil, Canada, Nigeria, and Norway, according to the New York Times. China, India, Russia are not attending, along with Saudi Arabia and other Gulf countries.