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We must improve the environment through __________ design and greener buildings.

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All fossil fuels are ______ resources that cannot be replaced after use.

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Pollution will reach to ______ levels in the future if we don't develop cleaner power sources to replace instead.

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There are still safety concerns and ______ that need to be addressed before we can make that a reality.

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People's lives will continue to be threatened ______ the continuous risk of earthquakes and tsunamis here.

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The mining project threatens one of the world's richest areas of __________.

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Visitors can wander around here without difficulty because most of the antique area is now a pedestrian __________.