How often does a bear "poop" each day on average?

Why don't we use "bear poop" as an alternative fuel? It's very plentiful and much easier to obtain (cheaper!) than gas and oil? It could be warmed and "melted down" in tube-like pipelines. This way, we could save the bears' habitats and utilize their "product" for our own use at the same time. Just brainstorming because oil will go up to over $120 a barrel.