研究：全球变暖 氢排放“有份”

Core Insights - Hydrogen emissions indirectly contribute to global warming, with a cumulative impact of 0.02 degrees Celsius on the global average temperature from 1990 to 2020 [1][4] Group 1: Hydrogen Emissions and Global Warming - The main reason hydrogen gas exacerbates global warming is its consumption of natural substances in the atmosphere that break down greenhouse gases like methane [4] - Increased hydrogen in the atmosphere leads to a reduction in these natural purifying substances, extending methane's residence time and worsening warming [4] - Hydrogen emissions are primarily sourced from human activities, particularly the decomposition of compounds like methane, which is rapidly increasing due to fossil fuel use, agricultural production, and landfill activities [4] Group 2: Trends and Estimates - Since 1990, the annual hydrogen emissions from methane decomposition have increased by approximately 4 million tons, reaching 27 million tons per year by 2020 [4] - From the industrial era until 2003, atmospheric hydrogen concentration rose by about 70%, stabilizing briefly before rising again around 2010 [4] - The relationship between hydrogen emissions and methane increase creates a vicious cycle: methane decomposition produces hydrogen, more methane leads to more hydrogen, and increased hydrogen prolongs methane's atmospheric presence [4] Group 3: Implications for Clean Energy - The indirect impact of hydrogen emissions on global warming may diminish the benefits of replacing fossil fuels with hydrogen energy [5] - There is a need for deeper understanding of the global hydrogen cycle and its connection to global warming [5]