People post on facebook assuming the privacy model of facebook, where they have revokable control of who sees what they share. What do you think your friends would say if you told them you're keeping a personal copy of their photos even if they try to delete them?
Please stop this. This is a huge violation of your friend's privacy. Just because a friend has shared something with you on facebook doesn't mean they expect it to be in someone's personal cambridge analytica forever.
That's similar performance to NASA's Gipsy solver and a couple other PPP solutions.
The practical problem is PPP falls apart when there's any sort of multipath or noise, with will be the case for any receiver not in a completely open field. A single nearby tree is often the difference between 4cm accuracy and a meter.
Amazon changed this because many recent lawsuits have used the fact there's no direct buyer seller relationship to argue Amazon should be liable for defective products instead of the seller.
No taxes on fuel isn’t a subsidy, there’s a natural race to the bottom on fuel prices because airlines can easily put more fuel in in a cheaper country.
Meanwhile, in Germany and France nearly 30% of the total cost of rail service is directly covered by the government, and it’s still more expensive than flying.
It does just stay there in a well run landfill, and microplastics mostly either come from tyres and cosmetics, or plastics that aren't disposed of in landfills.
There's some poorly run landfills, but how about we campaign to somewhat improve landfills instead of trying to reform all of modern society?
Direct Air Capture can pull carbon out of the atmosphere for ~$200 per tonne. Flying generates about 0.1 tonne per passenger-hour. We can make flying carbon neutral and it'd only be ~20% more expensive.