1. Taking all factors into account, what do you think of the following
geoengineering techniques? (please consider feasibility, cost, side
effects, political acceptability, etc.)
Promising major
solution
Promising contribution
Possibly useful
Not promising
Don't know
Count
Stratospheric sulphur aerosols 0.0% (0) 25.0% (1) 25.0%
(1) 50.0% (2) 0.0% (0) 4
Fake plastic trees (CO2 scrubber) 25.0% (1) 0.0% (0) 0.0%
(0) 50.0%
(2) 25.0% (1) 4
Ocean Iron Fertilisation 0.0% (0) 0.0% (0)
50.0%
(2) 50.0% (2) 0.0% (0) 4
Ocean Urea Fertilisation 0.0% (0) 0.0% (0)
25.0%
(1) 50.0% (2) 25.0% (1) 4
Cool roof (white pavements & roofs) 0.0% (0) 25.0% (1) 50.0%
(2) 25.0%
(1) 0.0% (0) 4
Pykrete or other ice stabilisation 0.0% (0) 0.0% (0)
25.0%
(1) 50.0% (2) 25.0% (1) 4
Reflective sheets in deserts etc. 0.0% (0) 0.0% (0)
25.0%
(1) 75.0% (3) 0.0% (0) 4
Space mirrors 0.0% (0) 25.0% (1)
25.0%
(1) 50.0% (2) 0.0% (0) 4
Moon dust in orbit 0.0% (0) 0.0% (0)
0.0%
(0) 75.0% (3) 25.0% (1) 4
Nuclear winter 0.0% (0) 0.0% (0)
0.0%
(0) 100.0% (4) 0.0% (0) 4
Tropospheric/low stratospheric smoke 0.0% (0) 0.0% (0) 0.0%
(0) 75.0%
(3) 25.0% (1) 4
Tropospheric sulphur aerosols 25.0% (1) 0.0% (0) 25.0%
(1) 50.0% (2) 0.0% (0) 4
Biochar burial 25.0% (1) 25.0%
(1) 0.0% (0) 50.0% (2) 0.0% (0) 4
Forestry projects 0.0% (0) 25.0% (1)
50.0%
(2) 25.0% (1) 0.0% (0) 4
Biomass Energy with Carbon Capture 0.0% (0) 50.0% (2) 25.0%
(1) 25.0%
(1) 0.0% (0) 4
Null - emissions cuts only 5 0.0% (2) 25.0% (1) 0.0%
(0) 25.0% (1) 0.0% (0) 4
Seawater spraying 25.0% (1) 0.0% (0)
25.0%
(1) 50.0% (2) 0.0% (0) 4
Reflective balloons 0.0% (0) 0.0% (0)
0.0%
(0) 75.0% (3) 25.0% (1) 4
Extract hydrochloric acid from sea 0.0% (0) 0.0% (0) 25.0%
(1) 50.0%
(2) 25.0% (1) 4
Using lasers to break up CFCs etc. 0.0% (0) 0.0% (0) 0.0%
(0) 66.7%
(2) 33.3% (1) 3
Burying wood & other biomass 0.0% (0) 0.0% (0) 0.0%
(0) 75.0%
(3) 25.0% (1) 4
Ocean pipes to force nutrient mixing 0.0% (0) 0.0% (0) 50.0%
(2) 50.0%
(2) 0.0% (0) 4
St. Lawrence dam 0.0% (0) 0.0% (0)
0.0%
(0) 75.0% (3) 25.0% (1) 4
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