THE Puente Roman hotel-resort in Marbella announced they are setting on a €384,000 eco-friendly plan to cut off up to 792 tons of CO2 emissions every year. The hotel is replacing two 1,266 kW heating oil boilers for three new renewable energy boilers. Olive stones will be used as combustible. This will be used for heating up water and the air condition system. Besides, the system they are incorporating switches off and on whenever it is needed.