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6.A. - Page 207 of 251 <br />Appendix <br />B.3 Trends in National and State Emissions <br />National Emissions <br />According to the U.S. EPA, gross total U.S. GHG emissions in 2017 were 6,456.7 million metric tons (MMT) of CO2 <br />equivalent (CO2e), representing a 12 percent decrease below 2005 levels .63 Emissions have also decreased 4.5 <br />percent since 2014, largely driven by transitioning power plants from using coal to natural gas, as well as warmer <br />winter conditions. CO2, the largest component of man-made GHGs, made up 81.6 percent of total U.S. GHG <br />emissions in 2017, followed by methane at 10.2 percent, nitrous oxide at 5.6 percent, and fluorinated gases at 2.6 <br />percent. <br />Figure 15: Gross U.S. GHG Emissions by Gas: 1990-201864 <br />&004 <br />� P, -4 � <br />Y. <br />'+ .hl "� :4 ti <br />M <br />F <br />c: 1,444 <br />5 <br />2088 <br />p <br />llllllircf, Pres,Sr, Hr,*wmpal <br />11111mrrmusoxior. <br />1r.irniANC <br />MCAR04N EIMMC <br />In 2018, the industrial sector contributed the largest share of GHG emissions (29.1 percent), followed by <br />transportation (27.9 percent), commercial (16.2 percent), residential (15.6 percent), and agriculture (10.5 percent). <br />Land use and forestry offset 11 percent of total gross emissions. Of the five main sectors, transportation has seen <br />the largest increase in emissions since 1990 (22 percent increase), while industrial emissions have seen the largest <br />decrease (15.5 percent decrease). <br />Figure 16: U.S. GHG Emissions by Economic Sector65 <br />2.500 <br />Electric Power Industry <br />2.000 <br />W Transportation <br />Q 1.500 <br />r <br />Industry <br />7.000 <br />Agriculture <br />500 Commercial <br />Residential N <br />v w u m it m m b nbi obi p a 6 m N O + v w L u 'm N m <br />City of Redwood City Climate Action Plan 76 <br />512 <br />