Many environment experts are pessimistic about the future of our (1) __________.They say that in the next few years harmful chemicals will further damage the (2) ___________ layer, there will be more losses of irreplaceable tropical rainforests, and serious air pollution will cause the climate itself to change. They also warn us that developing countries will continue to suffer ecological disasters, while the (3) ___________ countries consume the vast majority of the world’s fuels. Animals are also at (4)___________. It is feared that some endangered species may soon die out, as their natural (5) _________ are destroyed.