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We live in a time of great change and challenge. Our species has profoundly altered the Earth. Our use of fossil fuels to provide energy is altering climate, our use of Earth's soil resources to feed ourselves results in extinctions, over exploitation of fish populations has resulted in the population declines of many marine species, and freshwater resources are becoming scarce. At the same time, we see significant improvement in other indicators

Sciences de l'environnement --- Environmental sciences.