Pointing out that earth is a closed system so it's all good doesn't address these very real concerns about our unchecked national debt.

This kind of intellectual rationalization about something that is obviously not healthy is why people distrust so called experts.

In your analogy, people are dying of thirst, but it's ok because the whole world isn't losing water. Mmmkay.

The constitution grants Congress the sole power to declare war and authorize military force. The fact that our country's politicians have manipulated our system to the point that this has been disregarded basically since WWII should never be normalized.

This country has been run by the rich for a very long time and democracy is on its way out.

Anyone predicting the "end of humanity" is playing prophet and echoing the same nonsensical prophecies we heard with the invention of the printing press, radio, TV, internet, or a number of other step-change technologies.

There's a false premise built into the assertion that humanity can even end - it's not some static thing, it's constantly evolving and changing into something else.

Not true at all except for the lowest-sitting cruisers. Most bikes put you eye level with an SUV driver and taller bikes above.

In any case this study will likely go on the pile of papers judged by time to be an overreach of conclusions and a dead end.

Seems to me another enticing narrative with little to no sound evidence a la Guns, Germs, and Steel, Sapiens, and the like. The stuff this site loves to gobble up with comment after comment of supporting anecdata.

Honest question, how did you know to disregard the doctor 's instructions and start home exercises on the bone at 4 weeks? How did you limit yourself during your riding and other resistance work? How long was the recovery period after every session?

I shouldn't be too cynical, but it's a reminder to be skeptical, always.

That leap from organic molecules to "life" is still a bit of a mystery. And how often it occurs is still up for debate.

Look at Earth's history - trees existed for 60 million years before some chance bacterial mutation stumbled on efficiently breaking down lignin. And then boom, trees everywhere - every continent on earth - immediately (in geologic timescales) were decomposed.

The fact that it took 60 million years for extant bacteria to allow for that should give pause to any sweeping statements about the certainty of life and especially complex life.

Edit: wasn't trying to be snarky or anything. Honestly concerned for my family's health and trying to figure out the best path. Wood spatulas it is. Replacing all our PTFE pans with much more expensive cast iron pans isn't an option for our budget right now. Plus I haven't seen convincing scientific evidence that PTFE is as harmful as people here seem to imply. My understanding could be outdated though.

Still an interesting article, though!