Sustainable...

Found this the other day...

http://www.oregonlive.com/portland/index.ssf/2014/09/oregon_zoo_constructs_innovati.html

Oregon Zoo in the United States, has decided to make their polar bear enclosure a sustainable system to transfer heat to the elephants enclosure. 

I think this is a great idea, even though polar bears and elephants come from completely different places on the planet, it will help both species stay comfortable within captivity living in a different environment from their natural habitat. I generally do think this is a great idea, as it will reduce emissions, allow each species to display more natural behaviours and it will also help with conserving energy. 

(Oregon Zoo)

They will construct a geothermal loop that links heat generated from the polar bears cooling system in their pool and will then transfer it to the elephants new indoor enclosure. By installing this loop, it is predicted that it will reduce green house emissions and cut down the elephants land energy. It is believed that other renewable sources will be fed into this system later on when this is successful or not.