Optimal choice of which bets to make and how much to offer is simplified by the upper bound of 18 years, the high probability that most bet offers will be declined, the inability to reinvest gains (since all winnings go immediately to charity), and risk neutrality since it’s for a charity. As far as I can tell, there’s no need for advanced apparatus like decision trees or the Kelly criterion; one simply takes one’s available total investment, estimates the probability of winning to get the expected value, divides by years to get annual return, and offers to bet everything on whatever has the highest implied annual return >0%; then with whatever is left over, one moves onto the next bet, and so on until one runs out of money or bets. (So one would start with the nearest ~0% predictions…)

lb <- read.csv(stdin(), header=TRUE, colClasses=c("integer", "character", "factor", "numeric"))
Year,Prediction,ID,P
2020,"By 2020 a completely propellant-less (no material particles) ...",92,0.00
2020,"By 2020, 75% of all incremental new generation will come fr...",141,0.50
2020,"By 2020, GE crops will be grown on 10 fold more acreage tha...",522,0.50
2020,"By 2020, across at least 25% of the continental US, the cos...",655,0.50
2020,"By 2020, historians will agree that the start of the 21<sup>st</sup> c...",295,0.00
2020,"By 2020, in real or artificial life, sustainable evolutiona...",44,0.00
2020,"By December 31, 2020, synthetic solar energy (fusion) will ...",605,0.50
2020,"By the year 2020 solar electricity will be as cheap or chea...",76,0.50
2020,"By the year 2020 the technology will exist that will allow ...",143,0.00
2020,"By the year 2020, the tickets to space travel - at the leas...",27,0.00
2020,"China's current regime will be overthrown or reformed (anot...",588,0.02
2020,"My prediction is that artificial life; ie. life from non-...",195,0.50
2020,"Self-replicating manufacturing machines will be commonplace...",345,0.00
2020,"The first ice-free Arctic day (as defined by NSIDC) will oc...",653,0.40
2020,"By 2020, Urban and vertical farms will replace 10% of city ...",661,0.01
2020,"Turkish president Recep Tayyip Erdogan will be found guilty...",685,0.05
2020,"The CFR (Delivered) China price of Iron Ore (62% Fe) as pub...",718,0.15
2021,"A commercial airliner will be destroyed by terrorists hacki...",615,0.05
2021,"The rate of fatalities for seafarers will be ten times that...",724,0.50
2022,"By 02022, Aether Physics (or its equivalent) will take the ...",627,0.00
2022,"In ten years, people will be watching more live video than ...",623,0.05
2023,"Patents will be abolished by at least two leading economies...",343,0.00
2023,"Roe v. Wade will not celebrate a 50th anniversary.",347,0.33
2023,"advances in personal aviation will cause the cost of land i...",433,0.00
2024,"That by 2024 'artificial' life emerging somewhere out of th...",42,0.5
2024,"US accounting and banking regulations will not require that...",149,0.50
2024,"Apple will release an electric car within the next decade.",678,0.15
2025,"A third party candidate will be elected President of the Un...",583,0.05
2025,"By 2025 at least 50% of all U.S. citizens residing within t...",106,0.01
2025,"By 2025, Albert Einstein's theory of relativity will be con...",427,0.00
2025,"By 2025, Quantum field theory will no longer be part of The...",429,0.00
2025,"By 2025, Stellar nucleosynthesis will no longer be consider...",431,0.00
2025,"By 2025, The Aether Physics Model will not have replaced qu...",432,0.00
2025,"By 2025, The giant impact hypothesis will no longer be the ...",430,0.00
2025,"By 2025, at least 25 of the 30 stocks currently in the Dow ...",112,0.50
2025,"By 2025, more than 50% of desktop computers in the world wi...",270,0.05
2025,"By 2025, new astronomical observations and theories will re...",425,0.01
2025,"By 2025, the very first human being will be cloned and this...",284,0.10
2025,"By the end of 2024 there will be a Single Global Currency m...",226,0.00
2025,"Major online internet usage research firms will record tha...",88,0.00
2025,"Neither the Google car nor any other fully autonomous car w...",656,0.20
2025,"The concept of time as a linear dimension will be replaced ...",173,0.00
2025,"The nation with the highest (nominal) GDP in the world in 2...",491,0.50
2025,"By 2025, the underground economy in the USA will be worth m...",662,0.40
2025,"By 2025, oil and gas companies will find that their carbon ...",674,0.00
2025,"Due to a favorable political & social conditions, India's e...",684,0.03
2025,"The June, 2025 Labor Force Participation Rate and unemploym...",687,0.50
2029,"By December 31 02029 one of the world's top ten car manufac...",710,0.30
2030,"..effective computerized individual citizen profiling, with...",289,0.05
2030,"A nuclear explosive weapon will be used in war or terrorism...",521,0.25
2030,"By 2030 all surgical anesthesia will be administered and mo...",43,0.3
2030,"China will break apart by 2030",297,0.05
2030,"...China will lay an ownership claim to the entire moon.",624,0.01
2030,"By 2030, 30% of libraries existing today will not have wall...",657,0.10
2030,"By 2030, the apostrophe will have functionally disappeared ...",658,0.00
2030,"That the average level of innovation between 2025 and 2035 ...",321,0.35
2030,"Iranian women will become the dominant force in Iranian pol...",659,0.02
2031,"The average annual Palmer Drought Severity Index (PDSI) com...",652,0.60
2032,"By 02032, in response to studies correlating interactive me...",629,0.10
2032,"By 2032 you will be able to purchase a mass produced car th...",622,0.70
2035,"By the year 2035 non-invasive devices will allow us to inte...",285,0.30
2035,"One or more space agencies will send a manned mission to Ma...",351,0.40
2035,"There will be a Chernobyl National Park by 2035.",511,0.33
2035,"The United States will NOT adopt a single-payer health care...",682,0.75
2035,"The amount of geologically-derived crude oil consumed by th...",726,0.50
lb$Return <- with(lb, (2*(1-P)*1.03^(Year-2017) - 1.07^(Year-2017)) / (Year-2017))
lb[order(lb$Return, decreasing=TRUE),]
#    Year                                                     Prediction  ID    P          Return
# 1  2020 By 2020 a completely propellant-less (no material particles)... 92 0.00  0.320137000000
# 5  2020 By 2020, historians will agree that the start of the 21<sup>st</sup> c... 295 0.00  0.320137000000
# 6  2020 By 2020, in real or artificial life, sustainable evolutiona...  44 0.00  0.320137000000
# 9  2020 By the year 2020 the technology will exist that will allow ... 143 0.00  0.320137000000
# 10 2020 By the year 2020, the tickets to space travel - at the leas...  27 0.00  0.320137000000
# 13 2020 Self-replicating manufacturing machines will be commonplace... 345 0.00  0.320137000000
# 15 2020 By 2020, Urban and vertical farms will replace 10% of city ... 661 0.01  0.312852153333
# 11 2020 China's current regime will be overthrown or reformed...       588 0.02  0.305567306667
# 16 2020 Turkish president Recep Tayyip Erdogan will be found guilty... 685 0.05  0.283712766667
# 17 2020 The CFR (Delivered) China price of Iron Ore (62% Fe) as pub... 718 0.15  0.210864300000
# 18 2021 A commercial airliner will be destroyed by terrorists hacki... 615 0.05  0.206917682250
# 20 2022 By 02022, Aether Physics (or its equivalent) will take the ... 627 0.00  0.183199283580
# 21 2022 In ten years, people will be watching more live video than ... 623 0.05  0.160013802094
# 22 2023 Patents will be abolished by at least two leading economies... 343 0.00  0.147895706868
# 24 2023 advances in personal aviation will cause the cost of land i... 433 0.00  0.147895706868
# 30 2025 By 2025, Albert Einstein's theory of relativity will be con... 427 0.00  0.101919247868
# 31 2025 By 2025, Quantum field theory will no longer be part of The... 429 0.00  0.101919247868
# 32 2025 By 2025, Stellar nucleosynthesis will no longer be consider... 431 0.00  0.101919247868
# 33 2025 By 2025, The Aether Physics Model will not have replaced qu... 432 0.00  0.101919247868
# 34 2025 By 2025, The giant impact hypothesis will no longer be the ... 430 0.00  0.101919247868
# 39 2025 By the end of 2024 there will be a Single Global Currency m... 226 0.00  0.101919247868
# 40 2025 Major online internet usage research firms will record tha...   88 0.00  0.101919247868
# 42 2025 The concept of time as a linear dimension will be replaced ... 173 0.00  0.101919247868
# 45 2025 By 2025, oil and gas companies will find that their carbon ... 674 0.00  0.101919247868
# 29 2025 By 2025 at least 50% of all U.S. citizens residing within t... 106 0.01  0.098752322664
# 37 2025 By 2025, new astronomical observations and theories will re... 425 0.01  0.098752322664
# 46 2025 Due to a favorable political & social conditions, India's e... 684 0.03  0.092418472258
# 28 2025 A third party candidate will be elected President of the Un... 583 0.05  0.086084621851
# 36 2025 By 2025, more than 50% of desktop computers in the world wi... 270 0.05  0.086084621851
# 38 2025 By 2025, the very first human being will be cloned and this... 284 0.10  0.070249995833
# 27 2024     Apple will release an electric car within the next decade. 678 0.15  0.069286299249
# 55 2030 By 2030, the apostrophe will have functionally disappeared ... 658 0.00  0.040555571286
# 41 2025 Neither the Google car nor any other fully autonomous car w... 656 0.20  0.038580743799
# 53 2030       ...China will lay an ownership claim to the entire moon. 624 0.01  0.038296288650
# 57 2030 Iranian women will become the dominant force in Iranian pol... 659 0.02  0.036037006014
# 49 2030 ..effective computerized individual citizen profiling, with... 289 0.05  0.029259158105
# 52 2030                                 China will break apart by 2030 297 0.05  0.029259158105
# 14 2020 The first ice-free Arctic day (as defined by NSIDC) will oc... 653 0.40  0.028743133333
# 54 2030 By 2030, 30% of libraries existing today will not have wall... 657 0.10  0.017962744925
# 23 2023             Roe v. Wade will not celebrate a 50th anniversary. 347 0.33  0.016549954250
# 59 2032 By 02032, in response to studies correlating interactive me... 629 0.10  0.003020653944
# 50 2030 A nuclear explosive weapon will be used in war or terrorism... 521 0.25 -0.015926494616
# 48 2029 By December 31 02029 one of the world's top ten car manufac... 710 0.30 -0.021343862281
# 44 2025 By 2025, the underground economy in the USA will be worth m... 662 0.40 -0.024757760271
# 51 2030 By 2030 all surgical anesthesia will be administered and mo...  43 0.30 -0.027222907797
# 56 2030 That the average level of innovation between 2025 and 2035 ... 321 0.35 -0.038519320977
# 2  2020 By 2020, 75% of all incremental new generation will come fr... 141 0.50 -0.044105333333
# 3  2020 By 2020, GE crops will be grown on 10 fold more acreage tha... 522 0.50 -0.044105333333
# 4  2020 By 2020, across at least 25% of the continental US, the cos... 655 0.50 -0.044105333333
# 7  2020 By December 31, 2020, synthetic solar energy (fusion) will ... 605 0.50 -0.044105333333
# 8  2020 By the year 2020 solar electricity will be as cheap or chea...  76 0.50 -0.044105333333
# 12 2020 My prediction is that artificial life; ie. life from non-... 195 0.50 -0.044105333333
# 19 2021 The rate of fatalities for seafarers will be ten times that... 724 0.50 -0.046321800000
# 25 2024 That by 2024 'artificial' life emerging somewhere out of th...  42 0.50 -0.053701087293
# 26 2024 US accounting and banking regulations will not require that... 149 0.50 -0.053701087293
# 61 2035 By the year 2035 non-invasive devices will allow us to inte... 285 0.30 -0.055362555000
# 35 2025 By 2025, at least 25 of the 30 stocks currently in the Dow ... 112 0.50 -0.056427012306
# 43 2025 The nation with the highest (nominal) GDP in the world in 2... 491 0.50 -0.056427012306
# 47 2025 The June, 2025 Labor Force Participation Rate and unemploym... 687 0.50 -0.056427012306
# 63 2035               There will be a Chernobyl National Park by 2035. 511 0.33 -0.061037331871
# 62 2035 One or more space agencies will send a manned mission to Ma... 351 0.40 -0.074278477902
# 65 2035 The amount of geologically-derived crude oil consumed by th... 726 0.50 -0.093194400805
# 58 2031 The average annual Palmer Drought Severity Index (PDSI) com... 652 0.60 -0.097747312166
# 60 2032 By 2032 you will be able to purchase a mass produced car th... 622 0.70 -0.121616739384
# 64 2035 The United States will NOT adopt a single-payer health care... 682 0.75 -0.140484208062

I began offering bets with a capital of $1,200 with AMF as the beneficiary, roughly what I intended to donate in 2017. Offered bets: