91成人短视频

Replacing building materials with carbon-storing alternatives could sequester more than the amount of atmospheric carbon needed to keep the planet below 2掳C of warming 鈥� even if the transition doesn鈥檛 fully happen for another 50 years.

To meet the goals of the Paris Agreement, which aims to keep global temperatures from rising more than 2掳C above preindustrial averages by 2100 (and preferably below 1.5掳C), humanity will not only have to massively reduce greenhouse gases emissions, but also likely remove carbon from the atmosphere. The Intergovernmental Panel on Climate Change estimates that 6.5 gigatons of carbon-equivalent need to be removed from the atmosphere each year by 2050 to stay below 1.5掳C of warming. Over a century, this adds up to 300 gigatons of carbon to stay below 2掳C of warming, or 600 gigatons to stay below 1.5掳C.

Finding a storage solution for that much carbon isn鈥檛 easy, but a new paper published in the journal Science suggests that the greenhouse gas could be incorporated into what humans are already building: roads, homes, offices, and other structures. Building materials have the capacity to hold 16.6 gigatons of carbon dioxide annually, the new research finds. That is roughly half of all of what humans emitted in 2021.

While plastics hold the most carbon by weight, they鈥檙e relatively little-used in buildings, so the largest source of storage is in concrete and asphalt. Both could be created by reacting a mineral oxide with carbon...