[evan_au]

unfreezing the tundra

There are some projects to melt tar sands in the Canadian arctic
- To extract oil (to burn)
- And using the burning oil to melt more tar sand so they can extract more oil
- Extremely inefficient!

The other concern is that some areas of frozen tundra have kept a lot of carbon frozen
- If we melt the tundra (which was once a bog)
- Or it gets hot enough to burn
- Or if we drain the melted tundra to plant crops or grow beef
...then that frozen-in carbon/organic compounds could be freed to get into the atmosphere as CO₂

So I'm sure some people would benefit, but it may harm the planet's temperature overall.

[alancalverd]

Maybe older peaks were caused by previous civilisations who can tell as last 300 ppm peak was long ago.

120,000 years - no civilisation can possibly be blamed.