The document discusses the global warming potential (GWP) of methane over different timeframes. It notes that the IPCC typically uses a 100-year timeframe (GWP100) but some researchers now also look at a 20-year timeframe (GWP20) due to concerns about near-term climate change. Over 20 years, methane's GWP is 84 times that of CO2, compared to a GWP100 of 28 times CO2. Adopting the GWP20 standard significantly increases the estimated climate impact of methane emissions. The document suggests IPCC charts and greenhouse gas inventories may need to be modified to reflect this higher GWP20 value.