The issue is that some things are difficult to decarbonize because they emit carbon directly due to chemical processes or use gas for process heat. There is a l

The issue is that some things are difficult to decarbonize because they emit carbon directly due to chemical processes or use gas for process heat. There is a lot of investigation into whether these can be decarbonized economically, but a lot of it is still fairly early stages. It makes sense to have a variety of solutions available, especially for the short term.