Agricultural emissions, mostly methane but also land-use.
Metalysis (which exists, I want to see more roll-outs in more materials, particularly iron and steel).
At least one of "cheaper storage" or "the political solution to create a global power grid that I already know is both possible and affordable on paper" (c. 230 bn USD of aluminium).
Cheaper solutions to improve the insulation and cooling in older buildings.
Cement production is a significant contributor to global carbon dioxide emissions. Amazing that the development of effective cement recycling methods is in process.
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