在水中生长的植物释放沼气。
藻类是在水中生长的绿色植物，是地球上最早的生命体之一。
Algae are greens that grow in water and they date back to being one of the earliest types of life on our planet.
只要有充足的阳光和二氧化碳，海藻就可以在淡水或海水中生长。
Thriving on sunlight and CO2, algae can be grown in fresh or brackish water.
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