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Sunrise Movement climate protestors at Sen. Mitch McConnell's office. Photo: Aurora Samperio/NurPhoto via Getty Images

Republicans and Democrats staged a rhetorical war over climate change on the Senate floor yesterday, but it was just a theatrical preview of more consequential battles to come.

Where it stands: Majority Leader Mitch McConnell wants to put his opponents in a political bind over the Green New Deal resolution, which has uncertain Democratic support. Democrats are countering with attacks on GOP rejection of mainstream climate science and what they call the party's absence of effective ideas.

  • ABC News captures the action here, and Politico breaks down what's going on in this story.

The big picture: 2 things on my radar look at questions that will confront lawmakers if a window for actual legislation opens post-2020 election.

1. A Columbia University energy think tank published a new paper that offers a framework for considering policies that are either complementary or redundant with a tax on emissions from fossil fuel combustion and industrial processes.

They found "complementary" policies to a potential carbon tax include...

  • Ending fossil fuel subsidies.
  • Regulating emissions that aren't covered by the tax.
  • Appliance energy efficiency standards.
  • Public investment in low-carbon infrastructure.
  • Funding for technology R&D.

They found the "redundant" policies include...

  • Regulation of emissions already subject to the tax.
  • Other fuel taxes.
  • State-level carbon pricing.

Between the lines: Keeping costs in check while maximizing emissions cuts is part of the debate on policy.

Politically, there's a school of thought that says if there's ever going to be a big climate deal, it would involve a carbon tax tethered to paring back regulations.

  • Those are two pillars of the plan from the Climate Leadership Council and its advocacy offshoot, which are backed by some oil majors and other big companies.
  • But that said, the energy on the left has moved away from emphasis on pricing as a primary tool, which brings me to...

2. The filibuster battle is heating up.

What's happening: The Associated Press' Elana Schor reports that some liberal advocates are using the Democratic primary fight to argue that big things like Medicare for All can't happen with a 60-vote threshold.

  • Some of the field is supportive or leaning towards agreeing the filibuster should be killed, while others want to keep it or, like Sen. Kamala Harris, are conflicted.

Why it matters: Even if Democrats take full control of Washington, nobody thinks they'll have close to 60 Senate seats.

  • This can't be untethered from climate. A number of candidates are supporting the GND concept and calling for aggressive policies.

What's next: If Washington Gov. Jay Inslee's climate-focused presidential run gains traction, this could come up even more. He wants to see the filibuster done away with, and a campaign aide tells me it's something he'll keep talking about.

Go deeper: Alexandria Ocasio-Cortez's Green New Deal gets first fight in Senate

Go deeper

Cuomo faces fresh misconduct allegations from former aides

New York Gov. Andrew Cuomo during a February press conference in New York City. Photo: Seth Wenig/Pool/AFP via Getty Images

The office of New York Gov. Andrew Cuomo (D) was on Saturday facing fresh accusations of misconduct against his staff, including further allegations of inappropriate behavior against two more women. His office denies the claims.

Driving the news: The Washington Post reported Cuomo allegedly embraced an aide when he led the U.S. Department of Housing and Urban Development and that two male staffers who worked for him in the governor's office accused him of routinely berating them "with explicit language."

In photos: Protesters rally for George Floyd ahead of Derek Chauvin's trial

Chaz Neal, a Redwing community activist, outside the Minnesota Governor's residence during a protest in support of George Floyd in St.Paul, Minnesota, on March 6. Photo: Kerem Yucel/AFP via Getty Images

Dozens of protesters were rallying outside the Minnesota governor's mansion in St Paul Saturday, urging justice for George Floyd ahead of former Minneapolis police officer Derek Chauvin's trial over the 46-year-old's death.

The big picture: Chauvin faces charges for second-degree murder and manslaughter over Floyd's death last May, which ignited massive nationwide and global protests against racism and for police reform. His trial is due to start this Monday, with jury selection procedures.