Supreme Court justices at March 27 oral argument appeared unlikely to completely overturn a key precedent granting deference to EPA and other federal agencies' interpretations of their regulations, though several of the justices appeared open to the Trump administration's call to narrow the deference.

The Senate's unanimous rejection of the Green New Deal (GND) climate change resolution – with nearly all Democrats protesting the vote – is highlighting a larger battle in which each of the two parties is seeking to define itself as in the political mainstream, while dismissing the other side as fundamentally extremist.

The California Senate’s top environment panel is advancing a bill tasking the air board to study replacing the state’s sales and use tax with a new carbon tax, despite industry concerns that such a tax would clash with the state’s greenhouse gas cap-and-trade program, hurt manufacturers and potentially violate the Constitution’s “dormant commerce clause.”