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Environmentalists say they contribute to climate change by increasing carbon dioxide emissions.
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Global plant growth has increased so far, and plants absorb carbon dioxide.
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Scientists' warnings about the risks of carbon dioxide have often gone unheeded.
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It absorbs 30 per cent of carbon dioxide and our food source.
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And just how many parts per million carbon dioxide are too many?
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We must add the lessening of the carbon dioxide in the atmosphere.
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The rule covers global warming pollutants including carbon dioxide, methane, nitrous oxide.
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The main culprit is carbon dioxide, produced largely from burning fossil fuel.
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Similar initiatives on Mars melted the poles, releasing carbon dioxide and water.
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Normally in emissions markets, one permit equals 1 tonne of carbon dioxide.
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Different machine run on different combinations of carbon dioxide, argon, or nitrogen.
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They also produce gas, a major component of which is carbon dioxide.
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The bad news was that those causes did not include carbon dioxide.
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But like Mars, carbon dioxide was key to climate change on Earth.
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The same system feeds the algae nutrients and carbon dioxide it needs.
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Methane's twenty times more powerful as a greenhouse gas than carbon dioxide.