symbolset writes: Arctic temperatures 8C higher than current and CO2 levels of the current day supported Douglas fir and hemlock, sediments from lake El'gygytgyn in Russia some 300km north of the Arctic Circle reveal. These samples date from the Pliocene epoch some 2-3 million years ago and may give some insight into the what might happen in a warmer future. Link is a translation of a podcast. Research article is in the journal Science.
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals