We arrive at the following meta-ideas (models) by suspension of judgement and synergy; there may be unknown collateral issues:
Latent heat can be an energy source; exploiting temperature differential has the added benefit of reducing heat in the source.
The average global surface temperature is ~15°C, outer space ~-270°C, which represents an energy potential and the ability to do work.
A reflective layer in the atmosphere can deflect sunlight; less sunlight means less trapped heat.
Reducing CO2 levels in the composition of the atmosphere will allow more heat to be radiated into space.
Increasing the Earth's orbital distance from the Sun would result in diminished incidence of sunlight.
Even a very small object with a variable opacity or albedo, placed in a helio-geostationary orbit in space could reduce the incidence of sunlight.
Releasing the energy stored in the core of the Earth would make it more receptive to the absorbtion of latent heat.
Introducing areas where the CO2 levels are depleted would mean that there would be more heat funneled into space.
Lower CO2 density can be achieved by displacement; electrolizing water releases oxygen and creates an energy source (H2) that can be stored for later use.
Seeding the oceans with Iron to increase algae growth means more CO2 will be absorbed and sequestered at the bottom of the ocean.
Biological sequestration as part of photosynthesis, or as a fertilizer, or physical sequestration underground, in concrete or other building, or raw material.
Adding charcoal or Basalt rock dust to the topsoil has been demonstrated to improve crop yields and sequester greenhouse gases.
Volcanic eruptions emit aerosols that are beneficial in reflecting sunlight back into space, thus reducing the incident energy.
The loss of land and sea ice is detrimental to the reflectivity of the Earth. Increasing the albedo factor would mean less heat absorbed at the surface.
The very thing that annihilated the dinosaurs ~65M years ago, on a smaller scale, might create desirable aerosols.
Microreactors could provide a near limitless energy source to power the machines necessary to extract CO2, and other tasks.
A device for coordinating the overall heating and cooling of the climate and keeping temperatures within a favorable range.
The ocean tides can be harnessed to provide an energy source, this might also provide an opportunity for deacidification.
Conditioning waste heat or solar radiation with acoustic waves can produce significant cooling.
In addition to algae, other ocean-dwelling organisms such as seaweed and coral are efficient absorbers of carbon and potentially provide a nutrient-dense food source.
Acoustic or electromagnetic waves with the appropriate set of resonant frequencies could induce aggregation or degradation of molecular bonds in greenhouse gases, with desirable consequences.
A photon takes ~1M years to exit the Sun. Any lengthening of this process or otherwise dimming would reduce the energy incident to the Earth.
Lightning is capable of removing a significant amount of greenhouse gases from the atmosphere. A combination of cloud seeding and terrestrial lightning rods could also provide an energy source.
Bugs are an important source of protein, and have long been a staple of human diet. Insect farming presents an opportunity to replace animal protein with insect protein and significantly decrease land use for growing food for livestock.
The preparation of foods from raw ingredients is arguably, essential to human health. Changing the human diet of meat, dairy and processed foods to whole food, plant-based has merit.
A global council for natural resources could potentially buy, or take conservatorship of, natural resources like the Amazon and Boreal forests, and stranded fossil fuel assets.
A ubiquitous clean energy source that is freestanding, or supplied via an existing distribution network could reduce reliance on fossil fuels almost overnight.
Hydrogen has the distinct advantage that it can be produced sustainably, on-the-fly from sunlight and water and converted to electricity via a reversible fuel-cell.
A paradigm shift in the consensus of collective human consciousness for example "All life is sacred" could precipitate a mass rejection of some addictive impulse.
The complete cessation of all industrial greenhouse gas emissions including a worldwide War Effort to return the CO2 concentration of the atmosphere to pre-industrial levels.
Living soil has the ability to sequester significant carbon, benefitig from animal grazing, moisture retemtion and generating it's own microclimate.
Desertified land can be reclaimed by extracting moisture from the atmosphere to service root crops or replenish aquifers.
Everything else outlandish or outrageous, that just might fly!
If you feel your Idea deserves a different characterization you are probably on the right track - suggest a new category!
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