It's not quite five in the morning and we're walking along a track in the forest. The moon is high in the sky and provides enough light for us to see where we are going. A wolf howls in the distance. We have come to Poland's Białowieża Forest, the last refuge of the European bison, in the hope of getting a glimpse of this greatly endangered animal in its natural habitat.
Try to cool off without resorting to air conditioning.
The use of A/C can increase your electricity bill by 33 %. A fan requires one tenth of the energy used by an A/C system; sunshades, blinds, shutters and the cool of the night use no energy at all.
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