User blog comment:Joe333red/The NeoMH Lab/@comment-5028662-20130106145134/@comment-5460283-20130106165741

Well it was Democide's idea but i think i can explain it...

The tundra doesn't neccesarily need to have temperatures far below 0, just enough to have a premafrost on the ground year long (sorry didn't do a good job with that permafrost on the S.Lagombi picture[ tundra pictures are sooo hard to photoshop]). So if the temperature rose enough to melt a small layer of the permafrost plants with very low roots could grow which would mean more foliage (and if you look at area 7 of the Tundra there are bones below the ice, meaning the ice melted allowing the bones to sink).