Составление предложений, английский Можно 5 предложений в паст пёрфект на тему: загрязнений окружающей среды?

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By the end of last year, the levels of air pollution had reached dangerous levels in many cities around the world.Scientists had warned about the consequences of plastic pollution long before it became a major global issue.The government had failed to take effective measures to prevent water contamination in the local rivers.By the time we realized the extent of deforestation, many species had already lost their habitats.People had been protesting against industrial waste dumping for years before the government finally took action.