The inability to talk honestly about relative magnitudes led to stupid stuff like the "we're running out of landfills" panic of the 1990's, the ban on straws and aviation-shaming today, and will lead to a backlash where we are all driving Hummers in a Venus-like environment
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(If you are someone campaigning against commercial air travel who opposes nuclear power, you should be put on the no-fly list.)
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I like to eat steak that has that thick charred crust because it means I'm doing just a little bit more to fight climate change.
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Nuclear power plants take very long to build and cost so much money that it's really not a good idea to build them, compared to renewable alternatives.
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They can be built more quickly, safely, and at less cost given appropriate regulatory changes.
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How about a quality train system for regional travel, though?
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I dream of one every night! I travel to Japan a bunch and it is really painful seeing what we could have in California with different policy choices.
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If air travel is currently responsible for 5%, and it's growing much faster than expected and anticipated to use 25% of the world's carbon budget within decades, and not predicted to be amenable to decarbonization, did you conclude from that that it's not significant?
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The "carbon budget within decades" is not the same as the share of emissions they're talking about today. It refers to a capped budget. The conclusion I draw is that aviation right now is not a meaningful contributor to climate change, and we should focus on the big stuff first.
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Campaigning for reduced or more efficient air travel is a good thing, but it's a poor target to single out, as you say. The airlines already have fuel as the primary thing to optimize down, unlike, say, the car industry. If they could do better, they already would have done it.
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In the US at least, you could remove a lot of the need for air travel with a sane regional implementation of high-speed rail. There's no reason why Boston-NYC or NYC-DC shuttle flights should exist.
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