Olivia Guarna

14 posts
Olivia Guarna is the Climate Justice Fellow at the Sabin Center for Climate Change Law at Columbia Law School.

Court of Appeals Sets Aside Preliminary Injunction in GGRF Litigation

This is Part Two of a two-part blog series that examines the impact of federal grant termination litigation on the Inflation Reduction Act’s Greenhouse Gas Reduction Fund (GGRF). Part One, which covers recent Supreme Court orders that have shaped the D.C. Circuit’s consideration of the GGRF case, can be accessed […]

Sabin Center Submits Comment Letters on EPA’s Proposed Repeal of Power Plant GHG Emission Standards

On June 17, 2025, EPA published a proposed rule to either repeal entirely, or significantly revise, a rule issued in 2024 which set performance standards for fossil fuel-fired power plants to limit their greenhouse gas (GHG) emissions. This week, the Sabin Center filed three comment letters opposing the proposal. First, […]

Examining the Remarkable Rise of Ultra Vires Claims Against the Executive Branch

Since 2016, presidents and their administrations have increasingly drawn lawsuits arguing that they are overstepping their authority. In these ultra vires claims, litigants contend that presidential actions—including, for example, executive orders, proclamations, or memoranda, as well actions by executive agencies done at the President’s behest—exceed the scope of the authority […]

100 Days of Trump 2.0: The Inflation Reduction Act

This post is part of a new Climate Law Blog series, 100 Days of Trump 2.0, in which the Sabin Center offers reflections on the first hundred days of President Trump’s second term across a variety of climate-related topics. To read other posts from the series, which will roll out […]

100 Days of Trump 2.0: Updates from the Climate Backtracker

This post is the first of a new Climate Law Blog series, 100 Days of Trump 2.0, in which the Sabin Center offers reflections on the first hundred days of President Trump’s second term across a variety of climate-related topics. To read other posts from the series, which will roll […]

Interior Clears a Path for Fossil Fuel Development without Environmental Review

Yesterday, the Department of the Interior published a press release announcing the establishment of emergency permitting procedures to facilitate the rapid development of fossil fuel resources. Interior takes this action to fulfill a White House directive to rely on any and all emergency authorities to spur domestic energy production in […]