Active Volcanoes On Mars?

rm-r writes: "The BBC has a story here saying that two of the largest Martian volcanoes could still be active. The warmth provided by these could have produced conditions fit for life to develop." The article quotes Professor Tracy Gregg of the University of Buffalo, who says: "Of all the volcanoes on Mars, these volcanoes have the largest and greatest numbers of channels associated with them, indicating that there was a lot of water around when they were forming, though there doesn't appear to be any around now."