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Some species might go extinct _______ we reduce deforestation.

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Nuclear, wind, and solar power are _______ energy sources.

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In this zoo, some scientists are trying to _______ some species that are seriously endangered.

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_______ action earlier, the damage to coastal ecosystems would have been much less severe.

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If factories _______ proper filters, they wouldn’t have released so many harmful gases into the air.

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_______ people are choosing to support environmental charities through fundraising events.

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The less smoke is released into the air, the _______ the atmosphere becomes.

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_______ we act now or not, climate change will continue to affect future generations.