7 111 7 Source: T.M.L. Wigley University Corporation for Atmospheric Research Boulder, Colorado, U.S.A. Model W: IPCC 1992 scenarios - CO2 concentration (ppm) Mid-year CO2 concentration. YEAR IS92A IS92B IS92C IS92D IS92E IS92F 1990. 354.170 354.170 354.170 354.170 354.170 354.170 1991. 355.870 355.870 355.840 355.840 355.880 355.880 1992. 357.570 357.570 357.440 357.470 357.630 357.590 1993. 359.280 359.280 359.000 359.060 359.400 359.320 1994. 360.990 360.990 360.500 360.600 361.200 361.060 1995. 362.700 362.700 361.950 362.110 363.030 362.810 1996. 364.420 364.410 363.380 363.600 364.880 364.580 1997. 366.150 366.110 364.800 365.060 366.780 366.390 1998. 367.880 367.800 366.230 366.510 368.710 368.220 1999. 369.610 369.470 367.650 367.950 370.680 370.090 2000. 371.360 371.140 369.070 369.370 372.680 371.980 2001. 373.130 372.820 370.490 370.780 374.740 373.910 2002. 374.950 374.540 371.920 372.220 376.860 375.900 2003. 376.820 376.280 373.370 373.660 379.040 377.930 2004. 378.730 378.060 374.820 375.110 381.290 380.020 2005. 380.680 379.870 376.280 376.580 383.600 382.150 2006. 382.670 381.700 377.760 378.060 385.980 384.340 2007. 384.700 383.570 379.240 379.560 388.430 386.600 2008. 386.760 385.460 380.740 381.080 390.950 388.920 2009. 388.860 387.380 382.250 382.620 393.530 391.310 2010. 390.990 389.340 383.760 384.180 396.190 393.760 2011. 393.150 391.330 385.290 385.750 398.910 396.270 2012. 395.350 393.360 386.810 387.330 401.700 398.840 2013. 397.580 395.450 388.340 388.920 404.560 401.470 2014. 399.840 397.570 389.870 390.530 407.490 404.170 2015. 402.140 399.750 391.400 392.140 410.470 406.920 2016. 404.480 401.960 392.940 393.770 413.510 409.740 2017. 406.860 404.210 394.480 395.400 416.610 412.620 2018. 409.280 406.490 396.020 397.050 419.750 415.570 2019. 411.740 408.800 397.570 398.710 422.940 418.570 2020. 414.230 411.140 399.120 400.380 426.180 421.640 2021. 416.760 413.520 400.680 402.070 429.490 424.770 2022. 419.320 415.950 402.250 403.780 432.870 427.970 2023. 421.930 418.420 403.840 405.520 436.330 431.230 2024. 424.560 420.940 405.430 407.290 439.850 434.570 2025. 427.240 423.510 407.040 409.080 443.460 437.970 2026. 429.930 426.100 408.620 410.870 447.110 441.400 2027. 432.620 428.690 410.170 412.640 450.800 444.820 2028. 435.320 431.270 411.680 414.380 454.530 448.250 2029. 438.030 433.870 413.150 416.090 458.290 451.680 2030. 440.750 436.460 414.590 417.780 462.090 455.120 2031. 443.470 439.060 416.000 419.460 465.930 458.560 2032. 446.200 441.660 417.370 421.110 469.810 462.010 2033. 448.940 444.270 418.720 422.740 473.730 465.470 2034. 451.690 446.880 420.030 424.360 477.690 468.940 2035. 454.450 449.500 421.310 425.960 481.700 472.420 2036. 457.220 452.130 422.560 427.540 485.740 475.910 2037. 460.010 454.760 423.790 429.100 489.830 479.410 2038. 462.800 457.400 424.980 430.650 493.970 482.920 2039. 465.600 460.050 426.150 432.180 498.150 486.450 2040. 468.420 462.710 427.290 433.700 502.380 490.000 2041. 471.250 465.380 428.410 435.200 506.650 493.560 2042. 474.090 468.050 429.500 436.680 510.980 497.140 2043. 476.950 470.740 430.570 438.160 515.350 500.740 2044. 479.820 473.430 431.610 439.620 519.780 504.360 2045. 482.710 476.140 432.630 441.060 524.250 508.000 2046. 485.620 478.860 433.630 442.490 528.770 511.660 2047. 488.540 481.590 434.600 443.920 533.340 515.340 2048. 491.480 484.340 435.550 445.320 537.970 519.050 2049. 494.430 487.100 436.480 446.720 542.640 522.770 2050. 497.410 489.870 437.380 448.110 547.370 526.520 2051. 500.390 492.650 438.260 449.490 552.170 530.300 2052. 503.390 495.450 439.120 450.870 557.050 534.130 2053. 506.400 498.250 439.940 452.250 562.020 538.000 2054. 509.420 501.050 440.730 453.630 567.080 541.920 2055. 512.450 503.870 441.500 455.010 572.220 545.880 2056. 515.490 506.700 442.240 456.390 577.450 549.890 2057. 518.540 509.540 442.950 457.770 582.770 553.940 2058. 521.610 512.380 443.640 459.150 588.170 558.030 2059. 524.690 515.240 444.300 460.540 593.660 562.170 2060. 527.780 518.110 444.940 461.920 599.230 566.360 2061. 530.890 520.990 445.550 463.300 604.890 570.590 2062. 534.010 523.880 446.130 464.680 610.640 574.870 2063. 537.140 526.780 446.700 466.070 616.480 579.190 2064. 540.290 529.700 447.240 467.450 622.400 583.560 2065. 543.450 532.620 447.750 468.830 628.410 587.970 2066. 546.630 535.560 448.250 470.220 634.510 592.430 2067. 549.830 538.510 448.720 471.610 640.700 596.940 2068. 553.040 541.480 449.170 473.000 646.980 601.490 2069. 556.260 544.460 449.590 474.390 653.340 606.100 2070. 559.500 547.450 450.000 475.780 659.800 610.750 2071. 562.760 550.450 450.380 477.170 666.350 615.440 2072. 566.030 553.470 450.750 478.570 672.990 620.190 2073. 569.320 556.510 451.090 479.970 679.720 624.980 2074. 572.630 559.550 451.410 481.370 686.550 629.820 2075. 575.960 562.620 451.710 482.770 693.470 634.720 2076. 579.320 565.710 452.000 484.170 700.500 639.670 2077. 582.740 568.860 452.280 485.600 707.660 644.700 2078. 586.220 572.070 452.550 487.030 714.950 649.810 2079. 589.760 575.320 452.810 488.480 722.370 654.990 2080. 593.350 578.630 453.070 489.950 729.920 660.240 2081. 596.990 581.980 453.320 491.420 737.600 665.570 2082. 600.690 585.390 453.560 492.910 745.410 670.970 2083. 604.450 588.840 453.790 494.420 753.350 676.450 2084. 608.260 592.350 454.010 495.930 761.430 682.000 2085. 612.120 595.900 454.230 497.460 769.630 687.630 2086. 616.040 599.510 454.430 499.000 777.970 693.340 2087. 620.010 603.160 454.630 500.550 786.450 699.120 2088. 624.030 606.860 454.820 502.120 795.050 704.970 2089. 628.110 610.610 455.000 503.690 803.800 710.900 2090. 632.250 614.410 455.170 505.280 812.680 716.910 2091. 636.430 618.260 455.330 506.880 821.690 723.000 2092. 640.670 622.160 455.490 508.490 830.850 729.160 2093. 644.960 626.100 455.640 510.120 840.140 735.400 2094. 649.310 630.100 455.770 511.750 849.580 741.720 2095. 653.710 634.140 455.900 513.400 859.150 748.110 2096. 658.160 638.230 456.030 515.060 868.870 754.580 2097. 662.670 642.370 456.140 516.730 878.730 761.140 2098. 667.230 646.560 456.240 518.410 888.730 767.770 2099. 671.850 650.800 456.340 520.100 898.890 774.480 2100. 676.520 655.090 456.430 521.800 909.180 781.280