脱化 だっか せき燃料 ねんりょうではありませんでした
da' kasekinenryōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 脱化石燃料

1. Was not decarbonizing fossil fuels.; Was not a process of decarbonizing fossil fuels.

Past/Perfective
Negative
Polite
Formal Register