tl;dr:

....neither a Biden presidency nor Trump presidency would put the U.S. on track to achieving net zero emissions by 2050, the benchmark needed to prevent catastrophic warming of over 1.5 degrees Celsius

As alarming as that is, however, it does not mean that Biden and Trump are the same...

...a Trump administration would still add an additional 4 billion tons of greenhouse gas emissions to the atmosphere by 2030 compared to a Biden administration, according to Carbon Brief’s analysis.

That additional 4 billion tons could add more than $900 billion in global climate damages compared to Biden, the study’s authors claim.