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Directory of Solutions

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Article Page Name Page Overall Ranking Sector Total Atmospheric CO2-EQ Reduction (GT) NET COST (BILLIONS USD) SAVINGS (BILLIONS USD)
Refrigerant Management 164 1 Materials 89.74 N/A (902.77)
Wind Turbines (Onshore) 2 2 Electricity Generation 84.6 1,225.37 7,425.00
Reduced Food Waste 42 3 Food 70.53 N/A N/A
Plant Rich Diet 39 4 Food 66.11 N/A N/A
Tropical Forests 114 5 Land Use 61.23 N/A N/A
Educating Girls 80 6 Women and Girls 59.6 N/A N/A
Family Planning 78 7 Women and Girls 59.6 N/A N/A
Solar Farms 8 8 Electricity Generation 36.9 (80.60) 5,023.84
Silvopasture 50 9 Food 31.19 41.59 699.37
Rooftop Solar 10 10 Electricity Generation 24.6 453.14 3,457.63
Regenerative Agriculture 54 11 Food 23.15 57.22 1,928.10
Temperate Forests 128 12 Land Use 22.61 N/A N/A
Peatlands 123 13 Land Use 21.57 N/A N/A
Tropical Staple Trees 66 14 Food 20.19 120.07 626.97
Afforestation 132 15 Land Use 18.06 29.44 392.33
Conservation Agriculture 60 16 Food 17.35 37.53 2,119.07
Tree Intercropping 58 17 Food 17.2 146.99 22.10
Geothermal 6 18 Electricity Generation 16.6 (155.48) 1,024.34
Managed Grazing 72 19 Food 16.34 50.48 735.27
Nuclear 18 20 Electricity Generation 16.09 0.88 1,713.40
Clean Cookstoves 44 21 Food 15.81 72.16 166.28
Wind Turbines (Offshore) 2 22 Electricity Generation 15.15 545.30 762.50
Farmland Restoration 41 23 Food 14.08 72.24 1,342.47
Improved Rice Cultivation 48 24 Food 11.34 N/A 519.06
Concentrated Solar 14 25 Electricity Generation 10.9 1,319.70 413.85
Electric Vehicles 142 26 Transport 10.8 14,148.00 9,726.40
District Heating 99 27 Buildings and Cities 9.38 457.10 3,543.50
Multistrata Agroforestry 46 28 Food 9.28 26.76 709.75
Wave and Tidal 12 29 Electricity Generation 9.2 411.84 (1,004.70)
Methane Digesters (Large) 26 30 Electricity Generation 8.4 201.41 148.83
Insulation 101 31 Buildings and Cities
Ships 140 32 Transport 7.87 915.93 424.38
LED Lighting (Household) 92 33 Buildings and Cities 7.81 323.52 1,729.54
Biomass 16 34 Electricity Generation 7.5 402.31 519.35
Bamboo 117 35 Land Use 7.22 23.79 264.80
Alternative Cement 162 36 Materials 6.69 (273.90) N/A
Mass Transit 136 37 Transport 6.57 N/A 2,379.73
Forest Protection 108 38 Land Use 6.2 N/A N/A
Indigenous Peoples Land Management 124 39 Land Use 6.19 N/A N/A
Trucks 152 40 Transport 6.18 543.54 2,781.63
Solar Water 36 41 Electricity Generation 6.08 2.99 773.65
Heat Pumps 94 42 Buildings and Cities 5.2 118.71 1,546.66
Airplanes 150 43 Transport 5.05 662.42 3,187.80
LED Lighting (Commercial) 93 44 Buildings and Cities 5.04 (205.05) 1,089.63
Building Automation 106 45 Buildings and Cities 4.62 68.12 880.55
Water Saving Home 170 46 Materials
Bioplastic 168 47 Materials 4.3 19.15 N/A
In Stream Hydro 27 48 Electricity Generation 4 202.53 568.36
Cars 148 49 Transport 4 (598.69) 1,761.72
Cogeneration 22 50 Electricity Generation 3.97 279.25 566.93
Perennial Biomass 121 51 Land Use 3.33 77.94 541.89
Coastal Wetlands 112 52 Land Use 3.19 N/A N/A
System of Rice Intensification 48 53 Food 3.13 N/A 677.83
Walkable Cities 86 54 Buildings and Cities 2.92 N/A 3,278.24
Household Recycling 158 55 Materials 2.77 366.92 71.13
Industrial Recycling 160 56 Materials 2.77 366.92 71.13
Smart Thermostats 98 57 Buildings and Cities 2.62 74.16 640.10
Landfill Methane 100 58 Buildings and Cities 2.5 (1.82) 67.57
Bike Infrastructure 88 59 Buildings and Cities 2.31 (2,026.97) 400.47
Composting 62 60 Food 2.28 (63.72) (60.82)
Smart Glass 96 61 Buildings and Cities 2.19 932.30 325.10
Women Smallholders 76 62 Women and Girls 2.06 N/A 87.60
Telepresence 154 63 Transport 1.99 127.72 1,310.59
Methane Digesters (Small) 26 64 Electricity Generation 1.9 15.50 13.90
Nutrient Management 56 65 Food 1.81 N/A 102.32
High speed Rail 138 66 Transport 1.52 1,038.42 368.10
Farmland Irrigation 68 67 Food 1.33 216.16 429.67
Waste to Energy 28 68 Electricity Generation 1.1 36.00 19.82
Electric Bikes 146 69 Transport 0.96 106.75 226.07
Recycled Paper 166 70 Materials 0.9 573.48 N/A
Water Distribution 104 71 Buildings and Cities 0.87 137.37 903.11
Biochar 64 72 Food 0.81 N/A N/A
Green Roofs 90 73 Buildings and Cities 0.77 1,393.29 988.46
Trains 156 74 Transport 0.52 808.64 313.86
Ridesharing 144 75 Transport 0.32 N/A 185.56
Micro Wind 23 76 Electricity Generation 0.2 36.12 19.90
Energy Storage (Distributed) 34 77 Electricity Generation N/A N/A N/A
Energy Storage (Utilities) 32 77 Electricity Generation N/A N/A N/A
Grid Flexibility 30 77 Electricity Generation N/A N/A N/A
Microgrids 5 78 Electricity Generation N/A N/A N/A
Net Zero Buildings 84 79 Buildings and Cities N/A N/A N/A
Retrofitting 102 80 Buildings and Cities N/A N/A N/A
Repopulating the Mammoth Steppe 172 Coming attractions
Pasture Cropping 175 Coming attractions
Enhanced Wathering of Minerals 176 Coming attractions
Marine Permaculture 178 Coming attractions
Intensive Silvopasture 181 Coming attractions
Artificial Leaf 182 Coming attractions
Autonomous Vehicles 184 Coming attractions
Solid State Wave Energy 187 Coming attractions
Living Buildings 188 Coming attractions
Direct Air Capture 192 Coming attractions
Hydrogen Boron Fusion 194 Coming attractions
Smart Highways 196 Coming attractions
Microbial Farming 200 Coming attractions
Industrial Hemp 202 Coming attractions
A Cow Walks Onto A Beach 204 Coming attractions
Ocean Farming 206 Coming attractions
Smart Grids 209 Coming attractions
Building with Wood 210 Coming attractions