Someone who is concerned about the effects of climate change and how to prevent it in every state is a very good idea. However, let's not make it a huge position that is largely honorary and pays the big bucks. Perhaps it can be combined with another position or its duties can be explicitly spelled out and the salary kept moderate.
Climate change is an important issue, and it should be addressed on the federal level. Only in this way can the issue be solved for good. Federal officials will have authority over states, and they can make more drastic changes. It is too late for small solutions. Big changes are necessary to prevent global warming.