This is complete nonsense. There are a ton of environmental economists. It’s an active and vigorous field. There are “environmental and X” people for many other economics subfields, e.g., macro, development, structural, etc. There are a ton of people doing work on climate related topics.

By contrast I have never heard of this person. She’s not the first or the only or even an influential figure in the area of environmental economics.

Don’t assume the field doesn’t care about the environment just bc one article says so.