2. The global population has increased. There are much better levels of nutrition. (because of) 3. Nuclear explosions and detonations of nuclear weapons cause radioactive pollution. (lead to) 4.More and more roads are being built. Air pollution is rising. (as a consequence) 5 . In the last ten years, many BC valleys have been clearcut. 142 species of salmon have become extinct. (so) giúp em với

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