Julián Castro, President Obama’s former secretary of housing, thinks he can stand out in the crowded presidential field by focusing on climate change.

At a recent stop in New Hampshire, the candidate laid out his climate agenda and environmental bonafides. In 2016, focusing on climate change might have been an eye-catching strategy. But in 2019, Castro isn’t the only candidate, or even the first candidate this election cycle, to put the issue front and center.

Elizabeth Warren kicked off the climate policy discussion with a public lands bill in mid-April. Two months later, former Representative Beto O’Rourke and “climate candidate” Washington Governor Jay Inslee produced their own plans in quick succession. A host of other contenders, from New York Senator Kirsten Gillibrand to entrepreneur Andrew Yang, support the Green New Deal, an economy-wide climate deal that is being pushed by progressive beacon Representative Alexandria Ocasio-Cortez.

So which candidates actually have the green track records to live up to their climate promises?

new scorecard from environmental group Greenpeace USA assigned grades to all 19 of the Democrats who have qualified for the first two primary debates. They even scored the two Republican candidates, former Massachusetts Governor Bill Weld and President Trump (spoiler alert: They both got “Fs”).

Turns out, Castro might want to pick a different issue if he wants to stand out from the rest of the 2020 climate hawks. He scored a “D+,” while Inslee, who has a long history of championing environmental legislation, nabbed the highest score with an “A-.” Senators Cory Booker and Bernie Sanders ranked close behind Inslee with a “B+” each. According to Greenpeace, Castro neglected to set a net-zero greenhouse gas emissions target, concoct a plan to manage the phase-out of fossil fuels, or enact policies to fight environmental racism.

As a result, Castro garnered a measly 25 points out of the available 100. He’s still ahead of former Vice President Joe Biden, Colorado Governor John Hickenlooper, and Ohio Representative Tim Ryan, though. Those three got a “D-” apiece.