甲烷GWP当量计算器
使用甲烷GWP当量计算器基于全球变暖潜能值评估甲烷排放的气候影响。支持20年和100年GWP时间尺度换算，精确量化甲烷相对于CO₂的温室效应强度。
CO2e (20-year horizon)
40,000 kg CO2e
CO2e (20-year horizon) vs Methane Emitted
公式
Methane to CO2 Equivalence
Methane (CH4) is a potent greenhouse gas that traps far more heat per molecule than CO2 but breaks down faster in the atmosphere.
Formula
CO2-Equivalent = Methane Mass (kg) x GWP Factor
The 20-year GWP of methane is about 80, reflecting its intense short-term warming. The 100-year GWP is about 28, accounting for atmospheric breakdown. The choice of time horizon significantly affects policy priorities.
计算示例
A landfill releases 500 kg of methane per year.
- 0120-year CO2e = 500 x 80 = 40,000 kg CO2e
- 02100-year CO2e = 500 x 28 = 14,000 kg CO2e
- 03In tonnes (100-yr): 14,000 / 1,000 = 14 tonnes CO2e
常见问题
Why are there two GWP values for methane?
Methane breaks down in about 12 years, so its 20-year impact is much higher than its 100-year impact. The 20-year GWP captures its intense near-term warming.
What are the main sources of methane?
The largest sources are agriculture (livestock, rice paddies), fossil fuel extraction and transport, landfills, and wetlands.
Which GWP should I use?
GWP-100 is standard for most climate reporting. GWP-20 is useful when evaluating near-term climate impacts or short-lived climate pollutant strategies.