I don't agree with this type of plan generally. However, this article seemed to imply that the county owns $65 million in individual fossil fuel stocks out of a portfolio of $4 billion (so 1.6%). That doesn't seem too bad to sell those if it makes people feel better, as it likely won't change overall returns much.
But I totally disagree when/if the conversation turns to getting out of index funds because they own fossil fuel stocks, etc... That can only increase expenses and typically results in lower returns. And there is always the problem of where to draw the line - would you dump shares of companies like GM and Catepillar because most of the their products require burning gas, etc... The state of Vermont is having this same conversation.