7 511 4 Source: T.M.L. Wigley University Corporation for Atmospheric Research Boulder, Colorado, U.S.A. Model W: Specified emission reduction scenarios - CO2 concentration (ppm) Mid-year CO2 concentration. YEAR DEC0 DEC1 DEC2 1990. 354.170 354.170 354.170 1991. 355.870 355.870 355.870 1992. 357.570 357.570 357.570 1993. 359.280 359.280 359.280 1994. 360.990 360.990 360.990 1995. 362.700 362.700 362.700 1996. 364.420 364.420 364.420 1997. 366.150 366.150 366.150 1998. 367.880 367.880 367.880 1999. 369.610 369.610 369.610 2000. 371.360 371.360 371.360 2001. 373.090 373.070 373.060 2002. 374.800 374.730 374.670 2003. 376.480 376.330 376.190 2004. 378.130 377.890 377.640 2005. 379.770 379.390 379.020 2006. 381.380 380.840 380.320 2007. 382.980 382.260 381.560 2008. 384.550 383.620 382.740 2009. 386.110 384.950 383.850 2010. 387.650 386.240 384.910 2011. 389.170 387.480 385.910 2012. 390.680 388.690 386.850 2013. 392.170 389.870 387.740 2014. 393.650 391.010 388.590 2015. 395.110 392.110 389.380 2016. 396.560 393.180 390.130 2017. 397.990 394.220 390.840 2018. 399.420 395.230 391.500 2019. 400.830 396.210 392.130 2020. 402.220 397.160 392.710 2021. 403.610 398.080 393.260 2022. 404.980 398.970 393.770 2023. 406.330 399.830 394.240 2024. 407.680 400.670 394.680 2025. 409.010 401.480 395.090 2026. 410.330 402.260 395.470 2027. 411.630 403.020 395.820 2028. 412.920 403.750 396.130 2029. 414.200 404.450 396.410 2030. 415.470 405.130 396.670 2031. 416.720 405.790 396.900 2032. 417.960 406.420 397.100 2033. 419.190 407.020 397.270 2034. 420.410 407.610 397.420 2035. 421.620 408.170 397.550 2036. 422.820 408.710 397.650 2037. 424.000 409.230 397.730 2038. 425.180 409.730 397.790 2039. 426.340 410.210 397.830 2040. 427.500 410.670 397.850 2041. 428.640 411.110 397.850 2042. 429.780 411.540 397.830 2043. 430.910 411.940 397.800 2044. 432.020 412.330 397.750 2045. 433.130 412.700 397.680 2046. 434.230 413.050 397.590 2047. 435.330 413.380 397.490 2048. 436.410 413.700 397.380 2049. 437.480 414.010 397.250 2050. 438.550 414.290 397.110 2051. 439.610 414.560 396.950 2052. 440.650 414.810 396.770 2053. 441.680 415.040 396.580 2054. 442.700 415.250 396.370 2055. 443.700 415.440 396.140 2056. 444.690 415.610 395.890 2057. 445.670 415.760 395.630 2058. 446.640 415.890 395.360 2059. 447.590 416.010 395.070 2060. 448.540 416.110 394.760 2061. 449.470 416.190 394.450 2062. 450.400 416.260 394.120 2063. 451.310 416.310 393.770 2064. 452.210 416.340 393.420 2065. 453.110 416.360 393.050 2066. 453.990 416.360 392.670 2067. 454.860 416.350 392.290 2068. 455.720 416.320 391.890 2069. 456.580 416.280 391.480 2070. 457.420 416.230 391.060 2071. 458.260 416.160 390.630 2072. 459.090 416.080 390.190 2073. 459.910 415.980 389.740 2074. 460.720 415.870 389.280 2075. 461.520 415.750 388.820 2076. 462.320 415.620 388.350 2077. 463.120 415.490 387.880 2078. 463.920 415.350 387.410 2079. 464.720 415.210 386.940 2080. 465.520 415.070 386.480 2081. 466.320 414.920 386.010 2082. 467.120 414.770 385.550 2083. 467.920 414.610 385.080 2084. 468.710 414.450 384.620 2085. 469.510 414.290 384.150 2086. 470.310 414.120 383.690 2087. 471.110 413.950 383.230 2088. 471.910 413.780 382.770 2089. 472.710 413.600 382.300 2090. 473.500 413.420 381.840 2091. 474.300 413.230 381.380 2092. 475.100 413.040 380.930 2093. 475.890 412.850 380.470 2094. 476.690 412.650 380.010 2095. 477.480 412.460 379.550 2096. 478.280 412.250 379.100 2097. 479.070 412.050 378.640 2098. 479.860 411.840 378.190 2099. 480.650 411.630 377.740 2100. 481.440 411.410 377.290 2101. 482.240 411.200 376.840 2102. 483.030 410.980 376.400 2103. 483.830 410.760 375.950 2104. 484.620 410.540 375.520 2105. 485.420 410.330 375.080 2106. 486.220 410.110 374.650 2107. 487.020 409.890 374.230 2108. 487.830 409.670 373.800 2109. 488.630 409.450 373.380 2110. 489.440 409.230 372.960 2111. 490.250 409.010 372.550 2112. 491.060 408.780 372.140 2113. 491.870 408.560 371.730 2114. 492.680 408.340 371.330 2115. 493.490 408.110 370.930 2116. 494.300 407.890 370.530 2117. 495.120 407.670 370.130 2118. 495.930 407.440 369.740 2119. 496.750 407.210 369.350 2120. 497.570 406.990 368.970 2121. 498.390 406.760 368.590 2122. 499.210 406.540 368.210 2123. 500.030 406.310 367.830 2124. 500.850 406.080 367.460 2125. 501.670 405.850 367.090 2126. 502.500 405.620 366.720 2127. 503.320 405.390 366.350 2128. 504.150 405.170 365.990 2129. 504.970 404.940 365.630 2130. 505.800 404.710 365.280 2131. 506.630 404.480 364.920 2132. 507.460 404.250 364.570 2133. 508.290 404.020 364.220 2134. 509.120 403.780 363.880 2135. 509.950 403.550 363.530 2136. 510.780 403.320 363.190 2137. 511.610 403.090 362.860 2138. 512.450 402.860 362.520 2139. 513.280 402.630 362.190 2140. 514.120 402.400 361.860 2141. 514.950 402.160 361.540 2142. 515.790 401.930 361.210 2143. 516.620 401.700 360.890 2144. 517.460 401.470 360.570 2145. 518.300 401.230 360.250 2146. 519.140 401.000 359.940 2147. 519.980 400.770 359.630 2148. 520.820 400.540 359.320 2149. 521.660 400.300 359.010 2150. 522.500 400.070 358.710 2151. 523.350 399.840 358.410 2152. 524.190 399.610 358.110 2153. 525.030 399.380 357.810 2154. 525.880 399.140 357.520 2155. 526.720 398.910 357.220 2156. 527.570 398.680 356.930 2157. 528.420 398.450 356.650 2158. 529.270 398.220 356.360 2159. 530.110 397.980 356.080 2160. 530.960 397.750 355.800 2161. 531.810 397.520 355.520 2162. 532.660 397.290 355.240 2163. 533.510 397.060 354.970 2164. 534.360 396.830 354.700 2165. 535.220 396.600 354.430 2166. 536.070 396.370 354.160 2167. 536.920 396.140 353.890 2168. 537.770 395.910 353.630 2169. 538.630 395.680 353.370 2170. 539.480 395.450 353.110 2171. 540.340 395.220 352.850 2172. 541.200 394.990 352.600 2173. 542.050 394.760 352.340 2174. 542.910 394.540 352.090 2175. 543.770 394.310 351.840 2176. 544.630 394.080 351.600 2177. 545.490 393.850 351.350 2178. 546.350 393.630 351.110 2179. 547.210 393.400 350.870 2180. 548.070 393.180 350.630 2181. 548.930 392.950 350.390 2182. 549.800 392.730 350.150 2183. 550.660 392.500 349.920 2184. 551.520 392.280 349.690 2185. 552.390 392.050 349.460 2186. 553.250 391.830 349.230 2187. 554.120 391.610 349.000 2188. 554.990 391.390 348.780 2189. 555.850 391.160 348.560 2190. 556.720 390.940 348.330 2191. 557.590 390.720 348.120 2192. 558.460 390.500 347.900 2193. 559.330 390.280 347.680 2194. 560.200 390.060 347.470 2195. 561.070 389.840 347.250 2196. 561.940 389.630 347.040 2197. 562.810 389.410 346.830 2198. 563.690 389.190 346.630 2199. 564.560 388.970 346.420 2200. 565.440 388.760 346.210 2201. 566.310 388.540 346.010 2202. 567.190 388.330 345.810 2203. 568.060 388.110 345.610 2204. 568.940 387.900 345.410 2205. 569.820 387.680 345.210 2206. 570.690 387.470 345.020 2207. 571.570 387.260 344.830 2208. 572.450 387.050 344.630 2209. 573.330 386.840 344.440 2210. 574.210 386.630 344.250 2211. 575.100 386.420 344.060 2212. 575.980 386.210 343.880 2213. 576.860 386.000 343.690 2214. 577.740 385.790 343.510 2215. 578.630 385.580 343.330 2216. 579.510 385.380 343.140 2217. 580.400 385.170 342.960 2218. 581.280 384.960 342.790 2219. 582.170 384.760 342.610 2220. 583.060 384.550 342.430 2221. 583.950 384.350 342.260 2222. 584.840 384.150 342.090 2223. 585.720 383.940 341.910 2224. 586.610 383.740 341.740 2225. 587.510 383.540 341.580 2226. 588.400 383.340 341.410 2227. 589.290 383.140 341.240 2228. 590.180 382.940 341.070 2229. 591.070 382.740 340.910 2230. 591.970 382.540 340.750 2231. 592.860 382.350 340.590 2232. 593.760 382.150 340.430 2233. 594.660 381.950 340.270 2234. 595.550 381.760 340.110 2235. 596.450 381.560 339.950 2236. 597.350 381.370 339.790 2237. 598.250 381.180 339.640 2238. 599.150 380.980 339.490 2239. 600.050 380.790 339.330 2240. 600.950 380.600 339.180 2241. 601.850 380.410 339.030 2242. 602.750 380.220 338.880 2243. 603.650 380.030 338.730 2244. 604.560 379.840 338.590 2245. 605.460 379.650 338.440 2246. 606.370 379.470 338.290 2247. 607.270 379.280 338.150 2248. 608.180 379.090 338.010 2249. 609.090 378.910 337.870 2250. 609.990 378.720 337.720 2251. 610.900 378.540 337.580 2252. 611.810 378.350 337.450 2253. 612.720 378.170 337.310 2254. 613.630 377.990 337.170 2255. 614.540 377.810 337.030 2256. 615.450 377.630 336.900 2257. 616.370 377.450 336.760 2258. 617.280 377.270 336.630 2259. 618.190 377.090 336.500 2260. 619.110 376.910 336.370 2261. 620.020 376.730 336.240 2262. 620.940 376.560 336.110 2263. 621.860 376.380 335.980 2264. 622.770 376.210 335.850 2265. 623.690 376.030 335.720 2266. 624.610 375.860 335.600 2267. 625.530 375.680 335.470 2268. 626.450 375.510 335.350 2269. 627.370 375.340 335.220 2270. 628.290 375.170 335.100 2271. 629.210 375.000 334.980 2272. 630.140 374.830 334.860 2273. 631.060 374.660 334.740 2274. 631.990 374.490 334.620 2275. 632.910 374.320 334.500 2276. 633.840 374.150 334.380 2277. 634.760 373.990 334.270 2278. 635.690 373.820 334.150 2279. 636.620 373.660 334.030 2280. 637.550 373.490 333.920 2281. 638.480 373.330 333.810 2282. 639.410 373.170 333.690 2283. 640.340 373.000 333.580 2284. 641.270 372.840 333.470 2285. 642.200 372.680 333.360 2286. 643.130 372.520 333.250 2287. 644.070 372.360 333.140 2288. 645.000 372.200 333.030 2289. 645.940 372.040 332.920 2290. 646.870 371.880 332.810 2291. 647.810 371.720 332.710 2292. 648.750 371.570 332.600 2293. 649.690 371.410 332.500 2294. 650.620 371.260 332.390 2295. 651.560 371.100 332.290 2296. 652.500 370.950 332.180 2297. 653.440 370.790 332.080 2298. 654.390 370.640 331.980 2299. 655.330 370.490 331.880 2300. 656.270 370.340 331.780 2301. 657.220 370.190 331.680 2302. 658.160 370.030 331.580 2303. 659.100 369.890 331.480 2304. 660.050 369.740 331.380 2305. 661.000 369.590 331.280 2306. 661.940 369.440 331.190 2307. 662.890 369.290 331.090 2308. 663.840 369.150 331.000 2309. 664.790 369.000 330.900 2310. 665.740 368.850 330.810 2311. 666.690 368.710 330.710 2312. 667.640 368.560 330.620 2313. 668.600 368.420 330.530 2314. 669.550 368.280 330.430 2315. 670.500 368.140 330.340 2316. 671.460 367.990 330.250 2317. 672.410 367.850 330.160 2318. 673.370 367.710 330.070 2319. 674.330 367.570 329.980 2320. 675.280 367.430 329.890 2321. 676.240 367.290 329.810 2322. 677.200 367.160 329.720 2323. 678.160 367.020 329.630 2324. 679.120 366.880 329.540 2325. 680.080 366.750 329.460 2326. 681.050 366.610 329.370 2327. 682.010 366.470 329.290 2328. 682.970 366.340 329.200 2329. 683.940 366.210 329.120 2330. 684.900 366.070 329.040 2331. 685.870 365.940 328.950 2332. 686.830 365.810 328.870 2333. 687.800 365.670 328.790 2334. 688.770 365.540 328.710 2335. 689.740 365.410 328.630 2336. 690.710 365.280 328.550 2337. 691.670 365.150 328.470 2338. 692.640 365.020 328.390 2339. 693.610 364.900 328.310 2340. 694.580 364.770 328.230 2341. 695.540 364.640 328.150 2342. 696.500 364.510 328.070 2343. 697.460 364.390 328.000 2344. 698.420 364.260 327.920 2345. 699.380 364.140 327.840 2346. 700.340 364.010 327.770 2347. 701.300 363.890 327.690 2348. 702.250 363.770 327.620 2349. 703.200 363.640 327.540 2350. 704.150 363.520 327.470 2351. 705.100 363.400 327.390 2352. 706.050 363.280 327.320 2353. 707.000 363.160 327.250 2354. 707.940 363.040 327.180 2355. 708.890 362.920 327.100 2356. 709.830 362.800 327.030 2357. 710.770 362.680 326.960 2358. 711.710 362.560 326.890 2359. 712.650 362.440 326.820 2360. 713.590 362.330 326.750 2361. 714.520 362.210 326.680 2362. 715.460 362.090 326.610 2363. 716.390 361.980 326.540 2364. 717.320 361.860 326.470 2365. 718.250 361.750 326.410 2366. 719.180 361.640 326.340 2367. 720.110 361.520 326.270 2368. 721.030 361.410 326.200 2369. 721.960 361.300 326.140 2370. 722.880 361.180 326.070 2371. 723.800 361.070 326.010 2372. 724.720 360.960 325.940 2373. 725.640 360.850 325.870 2374. 726.560 360.740 325.810 2375. 727.480 360.630 325.750 2376. 728.390 360.520 325.680 2377. 729.300 360.410 325.620 2378. 730.220 360.310 325.550 2379. 731.130 360.200 325.490 2380. 732.030 360.090 325.430 2381. 732.940 359.980 325.370 2382. 733.850 359.880 325.310 2383. 734.750 359.770 325.240 2384. 735.660 359.670 325.180 2385. 736.560 359.560 325.120 2386. 737.460 359.460 325.060 2387. 738.360 359.350 325.000 2388. 739.260 359.250 324.940 2389. 740.150 359.150 324.880 2390. 741.050 359.050 324.820 2391. 741.940 358.940 324.760 2392. 742.830 358.840 324.710 2393. 743.720 358.740 324.650 2394. 744.610 358.640 324.590 2395. 745.500 358.540 324.530 2396. 746.390 358.440 324.470 2397. 747.270 358.340 324.420 2398. 748.160 358.240 324.360 2399. 749.040 358.140 324.300 2400. 749.920 358.050 324.250 2401. 750.800 357.950 324.190 2402. 751.680 357.850 324.140 2403. 752.560 357.750 324.080 2404. 753.430 357.660 324.030 2405. 754.310 357.560 323.970 2406. 755.180 357.470 323.920 2407. 756.050 357.370 323.860 2408. 756.920 357.280 323.810 2409. 757.790 357.180 323.760 2410. 758.660 357.090 323.700 2411. 759.520 357.000 323.650 2412. 760.390 356.900 323.600 2413. 761.250 356.810 323.550 2414. 762.110 356.720 323.490 2415. 762.980 356.630 323.440 2416. 763.830 356.540 323.390 2417. 764.690 356.440 323.340 2418. 765.550 356.350 323.290 2419. 766.400 356.260 323.240 2420. 767.260 356.170 323.190 2421. 768.110 356.090 323.140 2422. 768.960 356.000 323.090 2423. 769.810 355.910 323.040 2424. 770.660 355.820 322.990 2425. 771.510 355.730 322.940 2426. 772.350 355.640 322.890 2427. 773.200 355.560 322.840 2428. 774.040 355.470 322.790 2429. 774.880 355.380 322.740 2430. 775.720 355.300 322.700 2431. 776.560 355.210 322.650 2432. 777.400 355.130 322.600 2433. 778.240 355.040 322.550 2434. 779.070 354.960 322.510 2435. 779.910 354.880 322.460 2436. 780.740 354.790 322.410 2437. 781.570 354.710 322.370 2438. 782.400 354.630 322.320 2439. 783.230 354.540 322.280 2440. 784.060 354.460 322.230 2441. 784.890 354.380 322.180 2442. 785.710 354.300 322.140 2443. 786.540 354.220 322.090 2444. 787.360 354.140 322.050 2445. 788.180 354.060 322.010 2446. 789.000 353.980 321.960 2447. 789.820 353.900 321.920 2448. 790.640 353.820 321.870 2449. 791.450 353.740 321.830 2450. 792.270 353.660 321.790 2451. 793.080 353.580 321.740 2452. 793.900 353.500 321.700 2453. 794.710 353.430 321.660 2454. 795.520 353.350 321.620 2455. 796.330 353.270 321.570 2456. 797.130 353.200 321.530 2457. 797.940 353.120 321.490 2458. 798.750 353.040 321.450 2459. 799.550 352.970 321.410 2460. 800.360 352.890 321.370 2461. 801.160 352.820 321.320 2462. 801.960 352.740 321.280 2463. 802.760 352.670 321.240 2464. 803.560 352.600 321.200 2465. 804.350 352.520 321.160 2466. 805.150 352.450 321.120 2467. 805.950 352.380 321.080 2468. 806.740 352.300 321.040 2469. 807.530 352.230 321.000 2470. 808.330 352.160 320.960 2471. 809.120 352.090 320.930 2472. 809.910 352.020 320.890 2473. 810.700 351.940 320.850 2474. 811.480 351.870 320.810 2475. 812.270 351.800 320.770 2476. 813.060 351.730 320.730 2477. 813.840 351.660 320.700 2478. 814.620 351.590 320.660 2479. 815.410 351.520 320.620 2480. 816.190 351.460 320.580 2481. 816.970 351.390 320.550 2482. 817.750 351.320 320.510 2483. 818.530 351.250 320.470 2484. 819.300 351.180 320.440 2485. 820.080 351.120 320.400 2486. 820.860 351.050 320.360 2487. 821.630 350.980 320.330 2488. 822.410 350.910 320.290 2489. 823.180 350.850 320.250 2490. 823.950 350.780 320.220 2491. 824.720 350.720 320.180 2492. 825.490 350.650 320.150 2493. 826.260 350.590 320.110 2494. 827.030 350.520 320.080 2495. 827.800 350.460 320.040 2496. 828.560 350.390 320.010 2497. 829.330 350.330 319.970 2498. 830.090 350.260 319.940 2499. 830.860 350.200 319.910 2500. 831.620 350.140 319.870