In 2015, when President Barack Obama signed the US on to the Paris climate agreement, he did what all participating nations must do and made an emissions reductions pledge: The US would reduce its emissions 26 to 28 percent from 2005 levels by 2025.

President Donald Trump notoriously yanked the US out of the Paris agreement. Now President Joe Biden is getting the US back in, and once again, an emissions reductions pledge is required. Last Thursday, Biden offered it: The US will reduce emissions 50 to 52 percent from 2005 levels by 2030.

That is not, contrary to some of the more enthusiastic headlines, a doubling of Obama’s target or a halving of current emissions. It is a relatively modest boost in ambition and a halving of 2005’s much higher emissions. (Vox’s Umair Irfan has a great piece on this.)

Simon Evans @DrSimEvans

The US is expected to announce a climate goal of cutting emissions 50% below 2005 levels by 2030 One thing we need to clear up: **This is not double the Obama-era pledge for 2025** 28% by 2025 is equivalent to ~38% by 2030 So 50% isn't even a one-third increase in ambition!

5:09 AM ∙ Apr 22, 2021

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Nonetheless, it is an ambitious target that would require sweeping changes across US society, on which Biden’s infrastructure plan would be a mere down payment.

JesseJenkins @JesseJenkins

What does it take for the US to cut greenhouse gas emissions 50% below 2005 levels, as the Biden Adminstration is expected to announce later this week? Researchers at UMD modeled one pathway. Here's how it adds up. cgs.umd.edu/sites/default/…

1:40 AM ∙ Apr 22, 2021

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I suppose I should be excited about it, but reader, I must confess: I am not.

Read the rest of my monthly column over at Vox.