(1) the early recognition of the risks of lock in
(2) the realisation that there is very unlikely to be a single geoengineering solution, rather a suite of co-ordinated efforts (silver buckshot as opposed to a silver bullet)
(3) the desire, at governmental level, to have a balanced portfolio of research that includes a strong carbon dioxide reduction (CDR) component
(4) favouritism of the public towards CDR
(5) the trans-boundary ethical, political and governance challenges that a ‘solely global’ solution presents.