We can fix the cli­mate in one of two ways:

Reader's Digest (India) - - Mednews -

Re­move carbon diox­ide

If burn­ing fos­sil fu­els puts carbon diox­ide (CO2) into the at­mos­phere, can we get it out?

Air cap­ture— ex­tract­ing CO2 di­rectly from the air us­ing metal boxes or “sodium trees.” The cap­tured CO2 then has to be con­cen­trated and piped to burial sites un­der­ground.

Biochar— when heated with­out oxy­gen, plant ma­te­rial turns into char­coal. This biochar, with its trapped carbon, can be spread on the soil and lasts for many decades.

Lim­ing the oceans— oceans ab­sorb some of the CO2 from the air, but the ex­tra CO2 also makes them more acidic. Adding lime would off­set the acid­i­fi­ca­tion, al­low­ing more CO2 to be soaked up.

Stop so­lar ra­di­a­tion

Can we re­duce the amount of sun­light reach­ing the Earth’s sur­face, and so cool the planet?

Paint­ing roofs white— there are not enough roofs to make a dif­fer­ence.

Space mir­rors— mil­lions of small ones could be ori­ented to re­flect sun­light away from Earth, but it’s still sci­ence fic­tion.

Ma­rine cloud bright­en­ing— a se­ri­ous pro­posal with spe­cial ships spray­ing mi­cro-droplets of salt wa­ter into the air to help form low-ly­ing ma­rine clouds that re­flect sun­light back into space.

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