Table 2 Types and levels of awareness of novel marine-climate interventions (n = 332 respondents)

From: Novel marine-climate interventions hampered by low consensus and governance preparedness

Type

Detail

Sub-type

Awareness (%)

Marine geoengineering

Manipulation of the oceanic and atmospheric climate to increase uptake and removal of atmospheric carbon or mitigate direct heating effects

Shading and cooling water and habitat

40

Ocean fertilization

3

Ocean alkalinity enhancement

2

Artificial upwelling and downwelling

2

Marine bioengineering

Manipulation of marine evolutionary processes and ecosystem function and condition

Artificial habitat manipulation

79

Assisted evolution of marine species

66

Assisted migration and colonization of marine species

34

Controlling climate-exacerbated destructive species

2

Coastal and marine restoration

Repairing a climate-impacted catchment-to-marine ecosystem or population

Regrowing targeted underwater species

76

Regrowing targeted coastal species

66

Natural stabilization of reefs and coasts

62

Catchment habitat restoration

1

Marine social–institutional capacity building

Enabling communities and organizations to make marine-climate decisions and redress climate impacts

Anticipatory marine-climate science

1

Climate-resilient marine protected area management

1

Coastal adaptation community planning

1

Climate-adaptive fisheries management

1

Biological marine carbon dioxide removal

Creation or restoration of carbon sinks from natural marine resources

Aquaculture for carbon sequestration

56

  1. Five broad intervention types were apparent: marine geoengineering, marine bioengineering, coastal and marine restoration, marine social–institutional capacity building and biological marine carbon dioxide removal. Within these five broad types, 17 sub-types were apparent on the basis of their treatment and primary goal (that is, restorative in the case of coastal and marine restoration; adaptive in the case of marine bioengineering) and their focal sub-system (that is, catchment-to-ocean in the case of coastal and marine restoration; air–ocean exchange processes in the case of marine geoengineering). See Supplementary Table 2, for detailed typology.