Nobody here has mentioned the climate impact of choosing carbon fiber over steel.
Starling Cycles, a rare producer of steel mountain bikes, concluded that a typical carbon frame uses 16 times more energy than a steel frame.
https://solar.lowtechmagazine.com/2023/02/can-we-make-bicycles-sustainable-again/
Of course, any bicycle will be more sustainable than a car. But we're in a climate crisis, and that means taking extreme measures, including considering whether even low-impact tools like bicycles could be even more sustainable. We can't afford to be completely uncritical of any technology.
This is false. Methane is a more potent greenhouse gas than CO2 in the short term, and "natural gas" is just methane. When it leaks, it's very bad, and could be worse than coal. https://newrepublic.com/article/176605/natural-gas-way-worse-coal
While this is a good and necessary step, most old growth forests are already gone because they were not protected. Mature trees and forests that are less than 150 years old also need protection if we are to ever reverse the destruction and begin restoration, and expand protected areas. https://www.salon.com/2023/12/20/underwhelming-biden-admin-tosses-token-protection-to-old-growth-forests/
Gene drives are incredibly dangerous.
Just imagine if someone released a gene drive in humans, and somehow we fail to discover it for a few generations. That might be hard to imagine in a setting with lots of genetic testing, but what if it is released first in poor countries where genetic testing is not common, or it's released shortly before or after our civilization collapses?
Be careful what you wish for.
Worth reading this investigation into the historic photos: https://www.bellingcat.com/news/2023/08/16/untangling-the-mystery-of-the-worlds-first-rooftop-solar-panel/
Also worth pointing out there is some question as to whether these solar panels ever functioned. Someone should build one to test it out!
"unsafe for both"? What is the bike going to do to the car? Scratch the paint? Get blood on the tires?
That said, I agree that separated bike infrastructure saves lives and encourages biking by making people feel safer.
Could a "frunk" (trunk in front of the driver) help protect the driver's legs? Not big enough to block vision, just big enough to hold some bags.