Keeping pace with increasing costs has renewed interest in alternative fuels such as wood, coal, propane and natural gas. Each Monday on the Business page, the Bangor Daily News is featuring timely and relevant stories and graphics devoted to topics that matter to motorists, homeowners and businesses. Most of all, we want to answer your questions. E-mail the newspaper at energy@bangordailynews.net with questions or tips you want to share. We’ll try to find the answers and offer them here every Monday.