Originally Posted by smurgerburger View Post
Originally Posted by MisterV View Post
The graph shows many similar upward spikes.

See e.g. 300M years ago.

Man couldn't be responsible for that one.
Just from looking at the graph those previous spikes seem to have occurred over millions of years. The latest one looks like it's occurring in a much shorter period.
The upward spike at about 443 million years looks pretty nasty.
Some possible causes:
1. Alien technosignature from long-term visitors of that time period that have long since departed.
2. Advanced terrestrial civilization (aka lizard men/Silurian hypothesis) that was completely wiped away except for their technosignature of rapid heating at 443 million years.
3. Geological/rotational wobble of earth's axis/orbital/revolutional/solar system plane natural process in that time frame.
4. The Russians built a time machine.

IMHO number 3 is most likely (as in 99.999%).