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TL;DR
CO₂e lets us compare the warming impact of all greenhouse gases in one simple number.
CO₂ = 1 apple
Methane = 28 apples
Nitrous oxide = 298 apples
1 kg of beef = 60 kg CO₂e
→ That includes burps, poop, fertilizer, diesel, and deforestation.
→ That’s 60 apples’ worth of warming for every steak.