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EarthTalk®

Dear EarthTalk: Is it true that gas furnaces cost less to run and burn cleaner than their oil counterparts? If I make the switch, how long should I expect it to take for me to pay back my initial investment? And are there any greener options I should consider? — Veronica Austin, Boston, MA

EarthTalk®

Dear EarthTalk: I know that large fish contain a lot of mercury, but where does it come from? And what are we doing to prevent this contamination? — Alison Bronner, Atlanta, GA