6 111 7 Source: D. Wuebbles and A. Jain Lawrence Livermore National Laboratory Livermore, California, U.S.A. Model L: IPCC 1992 scenarios - CO2 concentration (ppm) Time is92a is92b is92c is92d is92e is92f 1990.50 354.193 354.193 354.193 354.193 354.193 354.193 1991.50 355.918 355.918 355.886 355.891 355.932 355.923 1992.50 357.620 357.620 357.495 357.513 357.674 357.638 1993.50 359.301 359.301 359.025 359.064 359.420 359.341 1994.50 360.964 360.964 360.480 360.549 361.171 361.033 1995.50 362.609 362.609 361.866 361.972 362.928 362.716 1996.50 364.257 364.248 363.226 363.367 364.714 364.418 1997.50 365.925 365.889 364.601 364.766 366.549 366.164 1998.50 367.612 367.533 365.989 366.169 368.432 367.953 1999.50 369.319 369.181 367.391 367.576 370.363 369.784 2000.50 371.045 370.833 368.807 368.987 372.340 371.656 2001.50 372.805 372.504 370.236 370.408 374.372 373.574 2002.50 374.611 374.207 371.677 371.841 376.466 375.540 2003.50 376.462 375.941 373.131 373.288 378.621 377.553 2004.50 378.357 377.705 374.598 374.748 380.836 379.614 2005.50 380.294 379.500 376.077 376.221 383.109 381.720 2006.50 382.269 381.325 377.568 377.710 385.445 383.881 2007.50 384.277 383.178 379.071 379.221 387.846 386.105 2008.50 386.316 385.060 380.587 380.752 390.312 388.390 2009.50 388.388 386.971 382.114 382.304 392.842 390.734 2010.50 390.492 388.910 383.654 383.875 395.434 393.138 2011.50 392.628 390.886 385.201 385.461 398.088 395.600 2012.50 394.796 392.908 386.751 387.058 400.804 398.119 2013.50 396.995 394.973 388.305 388.665 403.581 400.695 2014.50 399.227 397.083 389.863 390.283 406.419 403.327 2015.50 401.490 399.235 391.426 391.911 409.316 406.016 2016.50 403.790 401.426 392.993 393.551 412.270 408.764 2017.50 406.130 403.649 394.565 395.201 415.274 411.577 2018.50 408.510 405.904 396.142 396.863 418.330 414.453 2019.50 410.931 408.193 397.725 398.535 421.437 417.392 2020.50 413.391 410.515 399.314 400.220 424.596 420.393 2021.50 415.891 412.878 400.913 401.925 427.821 423.462 2022.50 418.430 415.292 402.527 403.658 431.125 426.601 2023.50 421.009 417.756 404.156 405.421 434.507 429.810 2024.50 423.627 420.268 405.799 407.211 437.966 433.089 2025.50 426.284 422.829 407.456 409.028 441.502 436.437 2026.50 428.964 425.415 409.102 410.847 445.096 439.821 2027.50 431.654 428.004 410.713 412.642 448.730 443.208 2028.50 434.354 430.599 412.291 414.417 452.406 446.601 2029.50 437.065 433.200 413.838 416.172 456.125 450.003 2030.50 439.790 435.809 415.355 417.909 459.888 453.416 2031.50 442.528 438.427 416.844 419.629 463.696 456.840 2032.50 445.280 441.055 418.306 421.334 467.550 460.279 2033.50 448.048 443.694 419.743 423.024 471.450 463.734 2034.50 450.832 446.344 421.155 424.701 475.398 467.205 2035.50 453.633 449.006 422.544 426.366 479.393 470.695 2036.50 456.451 451.682 423.911 428.018 483.437 474.204 2037.50 459.286 454.371 425.255 429.659 487.530 477.732 2038.50 462.140 457.075 426.579 431.290 491.673 481.282 2039.50 465.012 459.793 427.881 432.910 495.867 484.854 2040.50 467.903 462.526 429.164 434.521 500.111 488.448 2041.50 470.814 465.274 430.428 436.123 504.407 492.065 2042.50 473.745 468.039 431.672 437.715 508.755 495.706 2043.50 476.696 470.820 432.898 439.300 513.155 499.372 2044.50 479.667 473.618 434.106 440.876 517.607 503.063 2045.50 482.659 476.432 435.296 442.445 522.114 506.779 2046.50 485.672 479.264 436.469 444.007 526.674 510.522 2047.50 488.707 482.114 437.625 445.561 531.288 514.291 2048.50 491.764 484.981 438.764 447.109 535.957 518.087 2049.50 494.842 487.867 439.887 448.650 540.682 521.911 2050.50 497.943 490.771 440.993 450.184 545.461 525.762 2051.50 501.061 493.690 442.078 451.718 550.315 529.653 2052.50 504.193 496.621 443.137 453.257 555.258 533.594 2053.50 507.340 499.564 444.170 454.799 560.291 537.585 2054.50 510.501 502.520 445.178 456.346 565.413 541.625 2055.50 513.678 505.489 446.161 457.897 570.623 545.714 2056.50 516.870 508.472 447.121 459.452 575.921 549.852 2057.50 520.079 511.468 448.056 461.010 581.307 554.038 2058.50 523.304 514.479 448.969 462.572 586.781 558.274 2059.50 526.546 517.504 449.858 464.138 592.342 562.558 2060.50 529.805 520.544 450.725 465.706 597.991 566.890 2061.50 533.081 523.598 451.570 467.278 603.728 571.272 2062.50 536.375 526.668 452.393 468.853 609.552 575.702 2063.50 539.687 529.754 453.194 470.432 615.464 580.181 2064.50 543.017 532.855 453.974 472.013 621.464 584.708 2065.50 546.365 535.972 454.732 473.598 627.552 589.285 2066.50 549.732 539.105 455.469 475.186 633.729 593.911 2067.50 553.118 542.255 456.186 476.776 639.994 598.586 2068.50 556.523 545.420 456.882 478.370 646.348 603.311 2069.50 559.947 548.603 457.557 479.967 652.791 608.085 2070.50 563.390 551.802 458.212 481.566 659.323 612.909 2071.50 566.853 555.018 458.847 483.169 665.945 617.782 2072.50 570.335 558.251 459.462 484.775 672.658 622.706 2073.50 573.838 561.502 460.058 486.384 679.460 627.679 2074.50 577.360 564.770 460.633 487.995 686.353 632.703 2075.50 580.903 568.055 461.189 489.610 693.337 637.778 2076.50 584.486 571.377 461.733 491.234 700.430 642.915 2077.50 588.128 574.754 462.274 492.873 707.649 648.129 2078.50 591.829 578.186 462.811 494.527 714.993 653.418 2079.50 595.588 581.670 463.344 496.196 722.462 658.782 2080.50 599.404 585.207 463.872 497.878 730.056 664.221 2081.50 603.276 588.795 464.394 499.575 737.774 669.734 2082.50 607.203 592.435 464.911 501.285 745.617 675.321 2083.50 611.186 596.124 465.422 503.008 753.584 680.982 2084.50 615.223 599.864 465.927 504.744 761.675 686.716 2085.50 619.314 603.654 466.425 506.493 769.892 692.525 2086.50 623.458 607.493 466.917 508.255 778.233 698.407 2087.50 627.657 611.380 467.403 510.028 786.699 704.363 2088.50 631.909 615.317 467.881 511.815 795.290 710.393 2089.50 636.214 619.302 468.353 513.613 804.006 716.497 2090.50 640.572 623.336 468.817 515.424 812.849 722.674 2091.50 644.983 627.418 469.274 517.246 821.817 728.926 2092.50 649.447 631.548 469.724 519.081 830.911 735.252 2093.50 653.963 635.727 470.166 520.927 840.132 741.652 2094.50 658.532 639.953 470.601 522.784 849.480 748.126 2095.50 663.154 644.227 471.028 524.654 858.956 754.675 2096.50 667.828 648.549 471.448 526.535 868.559 761.298 2097.50 672.554 652.918 471.859 528.427 878.290 767.996 2098.50 677.333 657.336 472.263 530.331 888.149 774.769 2099.50 682.165 661.801 472.659 532.247 898.137 781.618 2100.50 687.049 666.314 473.047 534.173 908.255 788.541