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I would say it's pretty dang tough to not have cement. What do you use for a house foundation? Many apartments are made of cement and essentially every buildin

I would say it's pretty dang tough to not have cement. What do you use for a house foundation? Many apartments are made of cement and essentially every building uses a cement foundation. Luckily, cement is not a big part of the total emissions. Neither is long haul travel, particularly. Short haul flights are about half of all passenger-miles in air travel, can be made fully electric, and long-haul and medium haul flights can be split up into multiple legs for almost every route. EDIT:I will say there are ways to reduce CO2 emissions from cement. You can make clinker with electric heat just fine. But half the CO2 is from the clinker itself. Over time, cement will absorb the CO2 it emitted as it fully cures, but that can take a century. It’s possible to accelerate that process. It’s also possible to use alternatives, like sulfur cement.

loufe 5y ago
> Luckily, cement is not a big part of the total emissions. This is patently false. A quick search shows a number of 8% of global CO2 going to cement production and use emissions.
- Robotbeat 5y ago
  “Patently false?” No, I see 3% in direct emissions from the cement itself: https://ourworldindata.org/uploads/2020/09/Emissions-by-sector-%E2%80%93-pie-charts.png https://ourworldindata.org/uploads/2020/09/Emissions-by-sect... (As far as indirect emissions like transport, the heat to make the clinker, etc, then yeah, I can believe that it gets to 8% total.)
vbezhenar 5y ago
> What do you use for a house foundation? Rocks. > Many apartments are made of cement Make them from wood.
Emma_Goldman 5y ago
>Neither is long haul travel, particularly. Aviation and shipping make up 5-6% of GHG emissions, not a trivial amount. Aviation is projected to expand several-fold by 2050 which, in the context of decarbonisation, means it will take up a progressively larger fraction of global emissions over time. It will be one of the last and greatest challenges - which is exactly why it will require offsets, carbon capture or otherwise. The aviation's offset market, CORSIA, is already one of the most developed in the world. Your optimism about electrifying aviation is not shared by the industry.
patrickk 5y ago
> and long-haul and medium haul flights can be split up into multiple legs for almost every route. A better solution would be to eventually ban/tax out of existence regular jet fuel, and move to synthetically-produced jet fuel[1] which can be used in today's jet engines, but is carbon neutral. Perhaps eventually all fuels can be 100% synthetic when new jets are designed for it. [1] https://www.dw.com/en/sustainable-aviation-fuel-power-to-liquid/a-59398405 https://www.dw.com/en/sustainable-aviation-fuel-power-to-liq...

loufe 5y ago

> Luckily, cement is not a big part of the total emissions. This is patently false. A quick search shows a number of 8% of global CO2 going to cement production and use emissions.

Robotbeat 5y ago
“Patently false?” No, I see 3% in direct emissions from the cement itself: https://ourworldindata.org/uploads/2020/09/Emissions-by-sector-%E2%80%93-pie-charts.png https://ourworldindata.org/uploads/2020/09/Emissions-by-sect... (As far as indirect emissions like transport, the heat to make the clinker, etc, then yeah, I can believe that it gets to 8% total.)

vbezhenar 5y ago

> What do you use for a house foundation? Rocks. > Many apartments are made of cement Make them from wood.

Emma_Goldman 5y ago

>Neither is long haul travel, particularly. Aviation and shipping make up 5-6% of GHG emissions, not a trivial amount. Aviation is projected to expand several-fold by 2050 which, in the context of decarbonisation, means it will take up a progressively larger fraction of global emissions over time. It will be one of the last and greatest challenges - which is exactly why it will require offsets, carbon capture or otherwise. The aviation's offset market, CORSIA, is already one of the most developed in the world. Your optimism about electrifying aviation is not shared by the industry.

patrickk 5y ago

> and long-haul and medium haul flights can be split up into multiple legs for almost every route. A better solution would be to eventually ban/tax out of existence regular jet fuel, and move to synthetically-produced jet fuel[1] which can be used in today's jet engines, but is carbon neutral. Perhaps eventually all fuels can be 100% synthetic when new jets are designed for it. [1] https://www.dw.com/en/sustainable-aviation-fuel-power-to-liquid/a-59398405 https://www.dw.com/en/sustainable-aviation-fuel-power-to-liq...