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2 results for “environment”.

• Why There Are So Few Top Predators — The 10% Rule of Energy
  A forest can feed ten thousand deer, a thousand wolves at most, and one bear family per valley. The reason is not hunting skill or territory — it is thermodynamics, and the same arithmetic that limits your food chain also explains why eating lower on it feeds more people.
• How to Read the Air Quality Index (AQI): What the Number Actually Means
  The AQI turns a soup of pollution measurements into one number and one colour — here is what each band means for your lungs, why the same "150" is not the same everywhere, and how to act on it.