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All of those reduce emissions but they don't stop them and they don't do anything about the existing already-too-high levels.


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They're not removing co2 from the atmosphere. So they help reduce new emissions, but they don't help with the existing ones.

They do reduce large particulates but you are right, they do nothing for NO2, CO, and Hydrocarbons.

This doesn't address the issue of non-CO2 pollution. Which is especially bad in large cities.

Whoa there, we've certainly done plenty about emissions! Unfortunately in the wrong direction.

well, the emission of all these pollutants should go down proportionally if you can save some fuel

The CO2 emissions are unavoidable. DEF reduces particulates/PM2.5, but it doesn't do anything for reducing CO2.

You're just proving my point. You clearly have not had a real discussion with anyone who disagrees with your presumptions about the relative importance of emissions control. Your opponent is not a real person, it's a conservative stereotype (about a completely unrelated topic, no less).

They are bandaids with no guarantee of working and a lot of potential downsides with very dire consequences. It's still far easier and more effective to reduce carbon emissions.

They still pollute, even if they're carbon neutral. Particle emissions won't go away.

You can't ignore local pollution while attempting to drive down global emissions.

Just less usefully so, as emissions.

And CO2 is just one of many pollutants.

As r0muald and nitrogen said, reducing pollution definitely is not something that "makes no difference at all". But...

The other problem is that "makes no difference at all" is a good outcome. A bad outcome is that we reduce carbon usage drastically, which reduces economic output drastically, which causes many deaths. (This is not hyperbole. Take China, for instance. They're polluting like crazy, but even with all the pollution, people are better off. They're moving to the cities to get out of rural poverty. That poverty shortens life spans more than the pollution does.)


Why? Toxic emissions aren’t a given, they’re just cheaper than neutralizing or containing them.

The comment you replied to said 'mitigated', not 'solved'. Emissions controls already have, and still can, make enormous impacts on many consumer devices.

Given that emission controls are a whole lot easier to implement than eliminating a huge portion of the world's population, I'd say it's a more realistic goal to pursue.


Unfortunately just stopping will not be good enough. https://phys.org/news/2017-10-global-doesnt-emissions.html

A few thousands people generating no pollution won't even start to scratch the issue. It needs massive follow up to have an effect.

It is likely to help, of course, but it's a happy accident and doesn't come close to making up for the amount of pollution, deaths, and money spent on this unnecessary structure.

Just demolishing the Central Artery and replacing it with nothing would reduce emissions even more.
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