Is vaping less harmful than smoking, and does it help people quit?
45
votes
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Eliminating contrails from flying could be incredibly cheap
15 votes -
Earth has now passed peak farmland. What's next?
23 votes -
Ocean plastics: How much do rich countries contribute by shipping their waste overseas?
17 votes -
You want to reduce the carbon footprint of your food? Focus on what you eat, not whether your food is local.
9 votes