$totaldays = 365.26; #to start $totalseconds = $totaldays * 86400; $annual = 13.9; #terawatt-years $rate = 1.022; #2.2 increase in consuption rate per year (conservative, based on last 10 years, not last 200) $total = 30000000000; #KE of Earth = 30 billion terawatt years $runningtotal = $total; for ($year = 0; $year < 1000; $year++) { $annual *= $rate; $runningtotal -= $annual; if ($year%10 == 0) { $days = ($total-$runningtotal)/$total*$totaldays; $seconds = ($total-$runningtotal)/$total*$totalseconds; print "YEAR: $year CURRENT ANNUAL: $annual TOTAL SLOWDOWN: $days days, or $seconds seconds\n"; } } ---output--- YEAR: 0 CURRENT ANNUAL: 14.2058 TOTAL SLOWDOWN: 1.72960339342753e-07 days, or 0.0149437733192139 seconds YEAR: 10 CURRENT ANNUAL: 17.6593475555375 TOTAL SLOWDOWN: 2.12628534343465e-06 days, or 0.183711053672754 seconds YEAR: 20 CURRENT ANNUAL: 21.9524811054123 TOTAL SLOWDOWN: 4.55447974448903e-06 days, or 0.393507049923853 seconds YEAR: 30 CURRENT ANNUAL: 27.2893109537545 TOTAL SLOWDOWN: 7.57298845508575e-06 days, or 0.654306202519409 seconds YEAR: 40 CURRENT ANNUAL: 33.9235683089643 TOTAL SLOWDOWN: 1.13253216030935e-05 days, or 0.978507786507275 seconds YEAR: 50 CURRENT ANNUAL: 42.1706685362329 TOTAL SLOWDOWN: 1.59898779833654e-05 days, or 1.38152545776277 seconds YEAR: 60 CURRENT ANNUAL: 52.4227070865917 TOTAL SLOWDOWN: 2.17884266963501e-05 days, or 1.88252006656465 seconds YEAR: 70 CURRENT ANNUAL: 65.1671010604302 TOTAL SLOWDOWN: 2.89966505824992e-05 days, or 2.50531061032793 seconds YEAR: 80 CURRENT ANNUAL: 81.0097626893924 TOTAL SLOWDOWN: 3.79572532465286e-05 days, or 3.27950668050007 seconds YEAR: 90 CURRENT ANNUAL: 100.70390648352 TOTAL SLOWDOWN: 4.90962525482559e-05 days, or 4.24191622016931 seconds YEAR: 100 CURRENT ANNUAL: 125.185859634292 TOTAL SLOWDOWN: 6.29432348481216e-05 days, or 5.43829549087771 seconds YEAR: 110 CURRENT ANNUAL: 155.619578223028 TOTAL SLOWDOWN: 8.01565331881765e-05 days, or 6.92552446745845 seconds YEAR: 120 CURRENT ANNUAL: 193.451985688 TOTAL SLOWDOWN: 0.000101554526812513 days, or 8.7743111166011 seconds YEAR: 130 CURRENT ANNUAL: 240.481764530914 TOTAL SLOWDOWN: 0.000128154549760132 days, or 11.0725530992754 seconds YEAR: 140 CURRENT ANNUAL: 298.944871856588 TOTAL SLOWDOWN: 0.000161221258396548 days, or 13.9295167254617 seconds YEAR: 150 CURRENT ANNUAL: 371.62084444812 TOTAL SLOWDOWN: 0.000202326757665184 days, or 17.4810318622719 seconds YEAR: 160 CURRENT ANNUAL: 461.964947485652 TOTAL SLOWDOWN: 0.00025342534401816 days, or 21.8959497231691 seconds YEAR: 170 CURRENT ANNUAL: 574.272449712422 TOTAL SLOWDOWN: 0.000316946419664238 days, or 27.3841706589902 seconds YEAR: 180 CURRENT ANNUAL: 713.882835253317 TOTAL SLOWDOWN: 0.000395909994516116 days, or 34.2066235261924 seconds YEAR: 190 CURRENT ANNUAL: 887.433661016684 TOTAL SLOWDOWN: 0.000494070267890371 days, or 42.687671145728 seconds YEAR: 200 CURRENT ANNUAL: 1103.17612893161 TOTAL SLOWDOWN: 0.000616094116151998 days, or 53.2305316355326 seconds YEAR: 210 CURRENT ANNUAL: 1371.36737640792 TOTAL SLOWDOWN: 0.0007677829719829 days, or 66.3364487793226 seconds YEAR: 220 CURRENT ANNUAL: 1704.75813585388 TOTAL SLOWDOWN: 0.000956348644096375 days, or 82.6285228499268 seconds YEAR: 230 CURRENT ANNUAL: 2119.19894825872 TOTAL SLOWDOWN: 0.00119075619171376 days, or 102.881334964069 seconds YEAR: 240 CURRENT ANNUAL: 2634.39375231456 TOTAL SLOWDOWN: 0.0014821501544002 days, or 128.057773340177 seconds YEAR: 250 CURRENT ANNUAL: 3274.83667729092 TOTAL SLOWDOWN: 0.00184438440102629 days, or 159.354812248671 seconds YEAR: 260 CURRENT ANNUAL: 4070.97657801052 TOTAL SLOWDOWN: 0.0022946807910849 days, or 198.260420349735 seconds YEAR: 270 CURRENT ANNUAL: 5060.66467791608 TOTAL SLOWDOWN: 0.00285444796051663 days, or 246.624303788637 seconds YEAR: 280 CURRENT ANNUAL: 6290.95414614819 TOTAL SLOWDOWN: 0.00355029916186227 days, or 306.7458475849 seconds YEAR: 290 CURRENT ANNUAL: 7820.33716670517 TOTAL SLOWDOWN: 0.00441531754940358 days, or 381.48343626847 seconds YEAR: 300 CURRENT ANNUAL: 9721.52585763095 TOTAL SLOWDOWN: 0.00549062906642986 days, or 474.39035133954 seconds YEAR: 310 CURRENT ANNUAL: 12084.9092546741 TOTAL SLOWDOWN: 0.0068273577131845 days, or 589.883706419141 seconds YEAR: 320 CURRENT ANNUAL: 15022.8507162864 TOTAL SLOWDOWN: 0.0084890561574853 days, or 733.45445200673 seconds YEAR: 330 CURRENT ANNUAL: 18675.0300633442 TOTAL SLOWDOWN: 0.0105547272467681 days, or 911.928434120765 seconds YEAR: 340 CURRENT ANNUAL: 23215.0844372515 TOTAL SLOWDOWN: 0.0131225800745938 days, or 1133.79091844491 seconds YEAR: 350 CURRENT ANNUAL: 28858.8636056098 TOTAL SLOWDOWN: 0.0163146991778805 days, or 1409.59000896888 seconds YEAR: 360 CURRENT ANNUAL: 35874.6922010246 TOTAL SLOWDOWN: 0.020282848855087 days, or 1752.43814107951 seconds YEAR: 370 CURRENT ANNUAL: 44596.1267950993 TOTAL SLOWDOWN: 0.0252156885614252 days, or 2178.63549170714 seconds YEAR: 380 CURRENT ANNUAL: 55437.8143227045 TOTAL SLOWDOWN: 0.031347742427565 days, or 2708.44494574161 seconds YEAR: 390 CURRENT ANNUAL: 68915.2058204389 TOTAL SLOWDOWN: 0.0389705493410418 days, or 3367.05546306601 seconds YEAR: 400 CURRENT ANNUAL: 85669.0627380737 TOTAL SLOWDOWN: 0.0484465237059245 days, or 4185.77964819188 seconds YEAR: 410 CURRENT ANNUAL: 106495.920937137 TOTAL SLOWDOWN: 0.060226185867734 days, or 5203.54245897222 seconds YEAR: 420 CURRENT ANNUAL: 132385.960739694 TOTAL SLOWDOWN: 0.0748695813964375 days, or 6468.7318326522 seconds YEAR: 430 CURRENT ANNUAL: 164570.083499415 TOTAL SLOWDOWN: 0.093072907575503 days, or 8041.49921452346 seconds YEAR: 440 CURRENT ANNUAL: 204578.432876712 TOTAL SLOWDOWN: 0.115701613010047 days, or 9996.61936406804 seconds YEAR: 450 CURRENT ANNUAL: 254313.143120208 TOTAL SLOWDOWN: 0.143831544024176 days, or 12427.0454036888 seconds YEAR: 460 CURRENT ANNUAL: 316138.773057546 TOTAL SLOWDOWN: 0.178800094087709 days, or 15448.328129178 seconds YEAR: 470 CURRENT ANNUAL: 392994.725337847 TOTAL SLOWDOWN: 0.222269788091909 days, or 19204.1096911409 seconds YEAR: 480 CURRENT ANNUAL: 488534.995722453 TOTAL SLOWDOWN: 0.276307324489245 days, or 23872.9528358708 seconds YEAR: 490 CURRENT ANNUAL: 607301.896584902 TOTAL SLOWDOWN: 0.343481833231103 days, or 29676.8303911673 seconds YEAR: 500 CURRENT ANNUAL: 754942.014031582 TOTAL SLOWDOWN: 0.426987021023691 days, or 36891.6786164469 seconds YEAR: 510 CURRENT ANNUAL: 938474.665985804 TOTAL SLOWDOWN: 0.530793011106651 days, or 45860.5161596146 seconds YEAR: 520 CURRENT ANNUAL: 1166625.62465403 TOTAL SLOWDOWN: 0.659835096538096 days, or 57009.7523408915 seconds YEAR: 530 CURRENT ANNUAL: 1450241.96968573 TOTAL SLOWDOWN: 0.820248380965923 days, or 70869.4601154558 seconds YEAR: 540 CURRENT ANNUAL: 1802807.79556994 TOTAL SLOWDOWN: 1.01965946251265 days, or 88098.5775610933 seconds YEAR: 550 CURRENT ANNUAL: 2241085.29176829 TOTAL SLOWDOWN: 1.26754902842658 days, or 109516.236056057 seconds YEAR: 560 CURRENT ANNUAL: 2785911.67473421 TOTAL SLOWDOWN: 1.57570259949367 days, or 136140.704596253 seconds YEAR: 570 CURRENT ANNUAL: 3463189.86070202 TOTAL SLOWDOWN: 1.95877085414692 days, or 169237.801798294 seconds YEAR: 580 CURRENT ANNUAL: 4305119.97923034 TOTAL SLOWDOWN: 2.43496617200401 days, or 210381.077261146 seconds YEAR: 590 CURRENT ANNUAL: 5351730.27788064 TOTAL SLOWDOWN: 3.02692851290411 days, or 261526.623514915 seconds YEAR: 600 CURRENT ANNUAL: 6652780.20249385 TOTAL SLOWDOWN: 3.76280179830476 days, or 325106.075373531 seconds YEAR: 610 CURRENT ANNUAL: 8270126.13203324 TOTAL SLOWDOWN: 4.67757196990543 days, or 404142.218199829 seconds YEAR: 620 CURRENT ANNUAL: 10280662.2431477 TOTAL SLOWDOWN: 5.81473034139708 days, or 502392.701496708 seconds YEAR: 630 CURRENT ANNUAL: 12779976.3232508 TOTAL SLOWDOWN: 7.22834132478826 days, or 624528.690461706 seconds YEAR: 640 CURRENT ANNUAL: 15886894.3420171 TOTAL SLOWDOWN: 8.98561283811604 days, or 776356.949213226 seconds YEAR: 650 CURRENT ANNUAL: 19749129.8458222 TOTAL SLOWDOWN: 11.170091600544 days, or 965095.914287002 seconds YEAR: 660 CURRENT ANNUAL: 24550306.7667299 TOTAL SLOWDOWN: 13.8856352301465 days, or 1199718.88388466 seconds YEAR: 670 CURRENT ANNUAL: 30518689.5344681 TOTAL SLOWDOWN: 17.2613499915381 days, or 1491380.63926889 seconds YEAR: 680 CURRENT ANNUAL: 37938035.5508817 TOTAL SLOWDOWN: 21.4577289508203 days, or 1853947.78135087 seconds YEAR: 690 CURRENT ANNUAL: 47161085.9907471 TOTAL SLOWDOWN: 26.6742823667989 days, or 2304657.99649142 seconds YEAR: 700 CURRENT ANNUAL: 58626336.3279218 TOTAL SLOWDOWN: 33.1590230934593 days, or 2864939.59527488 seconds YEAR: 710 CURRENT ANNUAL: 72878883.9152038 TOTAL SLOWDOWN: 41.2202579622906 days, or 3561430.28794191 seconds YEAR: 720 CURRENT ANNUAL: 90596343.783402 TOTAL SLOWDOWN: 51.2412457472454 days, or 4427243.632562 seconds YEAR: 730 CURRENT ANNUAL: 112621064.785655 TOTAL SLOWDOWN: 63.6984186022984 days, or 5503543.36723858 seconds YEAR: 740 CURRENT ANNUAL: 140000177.753071 TOTAL SLOWDOWN: 79.1840332812878 days, or 6841500.47550327 seconds YEAR: 750 CURRENT ANNUAL: 174035379.688472 TOTAL SLOWDOWN: 98.4343290567743 days, or 8504726.0305053 seconds YEAR: 760 CURRENT ANNUAL: 216344820.909675 TOTAL SLOWDOWN: 122.364531062026 days, or 10572295.4837591 seconds YEAR: 770 CURRENT ANNUAL: 268940037.469516 TOTAL SLOWDOWN: 152.11236323515 days, or 13142508.183517 seconds YEAR: 780 CURRENT ANNUAL: 334321586.483933 TOTAL SLOWDOWN: 189.092139620078 days, or 16337560.8631747 seconds YEAR: 790 CURRENT ANNUAL: 415597931.199823 TOTAL SLOWDOWN: 235.062005710511 days, or 20309357.2933882 seconds YEAR: 800 CURRENT ANNUAL: 516633228.006871 TOTAL SLOWDOWN: 292.207526721119 days, or 25246730.3087047 seconds YEAR: 810 CURRENT ANNUAL: 642231041.695122 TOTAL SLOWDOWN: 363.245596859272 days, or 31384419.5686411 seconds YEAR: 820 CURRENT ANNUAL: 798362723.4122 TOTAL SLOWDOWN: 451.553609800768 days, or 39014231.8867864 seconds YEAR: 830 CURRENT ANNUAL: 992451309.192122 TOTAL SLOWDOWN: 561.33003157728 days, or 48498914.728277 seconds YEAR: 840 CURRENT ANNUAL: 1233724436.56618 TOTAL SLOWDOWN: 697.794010061751 days, or 60289402.4693353 seconds YEAR: 850 CURRENT ANNUAL: 1533653058.12287 TOTAL SLOWDOWN: 867.433511171766 days, or 74946255.3652406 seconds YEAR: 860 CURRENT ANNUAL: 1906496809.96527 TOTAL SLOWDOWN: 1078.31377903769 days, or 93166310.5088564 seconds YEAR: 870 CURRENT ANNUAL: 2369981963.75424 TOTAL SLOWDOWN: 1340.46078539067 days, or 115815811.857754 seconds YEAR: 880 CURRENT ANNUAL: 2946144194.50445 TOTAL SLOWDOWN: 1666.33789867053 days, or 143971594.445134 seconds YEAR: 890 CURRENT ANNUAL: 3662376232.20678 TOTAL SLOWDOWN: 2071.43843533895 days, or 178972280.813285 seconds YEAR: 900 CURRENT ANNUAL: 4552730206.23121 TOTAL SLOWDOWN: 2575.02226532123 days, or 222481923.723755 seconds YEAR: 910 CURRENT ANNUAL: 5659536600.43296 TOTAL SLOWDOWN: 3201.03149232752 days, or 276569120.937098 seconds YEAR: 920 CURRENT ANNUAL: 7035416789.64441 TOTAL SLOWDOWN: 3979.22874363877 days, or 343805363.45039 seconds YEAR: 930 CURRENT ANNUAL: 8745784840.44504 TOTAL SLOWDOWN: 4946.61218756092 days, or 427387293.005263 seconds YEAR: 940 CURRENT ANNUAL: 10871957520.405 TOTAL SLOWDOWN: 6149.17455333363 days, or 531288681.408025 seconds YEAR: 950 CURRENT ANNUAL: 13515020376.3161 TOTAL SLOWDOWN: 7644.08978333755 days, or 660449357.280364 seconds YEAR: 960 CURRENT ANNUAL: 16800633688.0385 TOTAL SLOWDOWN: 9502.43127855115 days, or 821010062.46682 seconds YEAR: 970 CURRENT ANNUAL: 20885006789.5044 TOTAL SLOWDOWN: 11812.550971976 days, or 1020604403.97872 seconds YEAR: 980 CURRENT ANNUAL: 25962324796.6055 TOTAL SLOWDOWN: 14684.2798827786 days, or 1268721781.87207 seconds YEAR: 990 CURRENT ANNUAL: 32273980834.0963 TOTAL SLOWDOWN: 18254.1498599111 days, or 1577158547.89632 seconds