Big climate questions arise at top UN court hearing

• Given the court's significance in international law, this case could have more of an impact than COP on countries' behavior and corporate policies — and on future legal action, compared to past more parochial climate cases.

The big picture: Representatives from Barbados expressed the prevailing, dim view of the UN climate summit process among many developing countries appearing Monday before the 15-judge panel.

• "To say that we Barbadians are disappointed is to measure the distance between what has over the years been promised against what has in fact been delivered," said Robert Volterra, a co-representative of the country, before the ICJ.
• The outcome of COP29 was an agreement that calls for "at least" $300 billion a year for climate finance flowing from industrialized countries by 2035.
• That amount was agreed to even though studies have shown developing countries need at least $1 trillion per year to adapt to climate change impacts and decarbonize their energy systems.

Our thought bubble: Had the annual climate summits proven effective at cutting emissions and addressing developing countries' climate justice concerns, the ICJ case might not be necessary.

Zoom in: The case at the world court concerns countries' obligations under international law to take action on climate change, and what they have done to date.

• Arguments on Monday centered around the scope of a potential decision, as well as the plight of the world's most vulnerable nations.
• Vanuatu's representatives, for example, emphasized the inequities between the countries that have emitted the most greenhouse gases and the ones suffering from their effects.
• "The conduct on trial is that of states, which have failed for over a century, despite increasingly dire warnings, to rein in the emissions from their territories," said Vanuatu climate envoy Ralph Regenvanu.

Meanwhile, the Bahamas called for countries to be held accountable for their planet-warming emissions from burning fossil fuels for energy.

• "We insist on liability, and we demand reparations," said Bahamas Attorney General Leo Pinder, emphasizing the country's extreme vulnerability to climate change-related sea level rise and more severe hurricanes.

Yes, but: Some countries are seeking to limit the scope of any advisory opinion from the 15-judge panel.

• According to Earth Negotiations Bulletin, representatives of Saudi Arabia told justices that they should limit their decision to considering country obligations under three specific climate agreements, rather than incorporating other areas of international law, such as human rights.
• The Saudis also argued against the notion that future generations — which will be more severely affected by climate change impacts than some current generations — have rights to a hospitable climate.
• Other countries, like Germany, also advocated for climate agreements to date to form the basis of the advisory opinion, not broader human rights law.

The intrigue: In its remarks on Monday, Barbados pushed back against the idea that only three international climate agreements are applicable to the ICJ case.

• The country's representatives noted that other nations share their view that the climate agreements struck over the years, such as the 1992 U.N. Framework Convention on Climate Change, 1995 Kyoto Protocol and 2015 Paris Agreement, are not an "exclusive self-contained legal regime," Volterra said.
• In other words, human rights law and rulings on air pollution that crosses national boundaries — among other legal instruments — may apply to this case, Barbados and others asserted.

What we're watching: How the next two weeks of testimony unfold, including U.S. contributions scheduled for Wednesday.

• The hearings may offer hints as to what the nonbinding ruling will say, along with any potential ramifications for countries rich and poor.