Over the summer, environmental and clean energy groups put aside their reservations about Democratic presidential candidate Joe Biden and came together behind his $2.2 trillion dollar climate plan—the most ambitious ever put forth by a candidate for the U.S. presidency, as they pointed out again and again. Now, with just weeks to go until the election and Biden leading in the polls, one environmental group has crunched the numbers and is saying that the plan doesn’t go far enough.

Carbon Switch, a Colorado-based group that promotes energy efficiency, tested some of the assumptions of the Biden plan by plugging them into a model created by the National Renewable Energy Laboratory, which estimates the amount of energy used by each American household. The report finds that while Biden’s plan clearly cuts more carbon and creates more jobs than any energy policy promoted by President Trump, Biden’s policies wouldn’t reduce greenhouse gas emissions enough for the U.S. to meet existing climate targets.

One of the core mechanisms in Biden’s plan is a pledge to upgrade 4 million buildings and weatherize 2 million homes, which the campaign has said would create 1 million jobs. In analyzing this commitment, the report found that “Biden’s weatherization plan would generate $14 billion in economic activity, create 106,000 jobs, and save 2 million Americans $606 per year on their utility bill. However it wouldn’t achieve the carbon reductions necessary to meet the Paris targets,” the report said, referring to the 1.5° Celsius ceiling for global warming outlined in the 2015 Paris Climate Agreement.

“Biden says his administration will set a target of reducing the carbon footprint of the U.S. building stock 50% by 2035,” said Michael Thomas, founder and head of research for Carbon Switch. “But the commitments listed in his plan would only reduce emissions by a few percent each year—not enough to get there, or even close.”

Carbon Switch also evaluated the plan’s job creation claims against real gains from similar investments as part of the 2009 financial crisis stimulus package. Even scaling up for the much bigger expenditures proposed by Biden, researchers found that only about 110,000 jobs would be created.

The Green New Deal, by contrast, which proposes a more radical overhaul of the U.S. economy and has become a flashpoint for Republicans and some moderate Democrats, “would create 10 million jobs, generate $1.2 trillion in economic activity, and reduce annual emissions by 263 million metric tons,” according to Carbon Switch.

Another report released last week by Quantum Energy Consultants, a Santa Barbara-based company, had a far more positive view of Biden’s climate plan.

Quantum built on a previous analysis from the University of California, Berkeley’s Goldman School of Public Policy that compared two scenarios in 2035: one in which no new energy plan is put in place and the fossil-fuel commitments made by the Trump administration continue uninterrupted, and one in which Biden’s plan to move to 100% carbon-free electricity generation by 2035 is enacted. (The researchers actually used 90% clean energy by 2035, assuming the last 10% might be too difficult to achieve.)