MONTPELIER — Environmental activist Bill McKibben will speak to the Vermont Legislature about climate change and how it relates to the state.

House Speaker Shap Smith said Friday he’s invited McKibben to speak Wednesday afternoon.

Vermont Public Radio said McKibben’s been supporting a campaign to get resolutions on town meeting day ballots that oppose the shipment of tar-sands oil across northeastern sections of the state.

Smith’s office said it prioritizes climate change as one of the most important challenges facing the state.