There are numerous corporations that would be negatively impacted by this trade deal. It's not a white-and-black "all corporations would love this deal" type situation.
I don't know the details on this particular case, but its not on the face of it ridiculous.
Currently, European oil and gas corporations are pushing for a carbon tax. The reason is that they think they'd displace a lot of coal usage if both where priced accurately. In the US the coal lobby is currently stronger than the gas lobby (even with cracking).
Corporations compete, even in lobbying, sometimes this leads to surprisingly positive sounding outcome.
(I say "sounding" as its not clear if the worse-than-carbon-for-climate-change methane that gas production produces would be costed properly if gas companies are driving the "carbon" tax)
