The GreenHeart line of phones hopes to make a difference by lowering the levels of CO2 emitted during production, using as much recycled materials as possible and also minimising the amount of packaging that the phones are retailed in. The new Elm and Hazel phones are not the first GreenHeart handsets but are a noticeable improvement on the earlier Naite and C901.

The two phones come with an e-manual which is loaded onto the handsets themselves, saving paper, a low intensity battery charger and the WalkMate application which encourages you to walk rather than drive. Both phone feature a 5 megapixel camera with LED flash and video recording; TrackID, SensMe and PlayNow features for the media player; as well as Wi-Fi, USB, GPS and threaded SMS.

While the two phones are remarkably similar in specifications there are noticeable differences. The Hazel features a larger 2.6″ screen with 16 million colours compared to the Elm’s 2.2″ 256k colour display. While they both feature an ergonomic design to be more easily held, the Hazel comes in a sliding form and the Elm is a standard candybar design.

Both phones are set for release in early 2010 although the Elm will be released first. If you want to do your part for the environment then make sure you take a good look at the Sony Ericsson Elm deals and Sony Ericsson Hazel deals as they become available.