Now we have yet another reason to stop the PolyMet/NorthMet copper-nickel mine in its tracks and save thousands of acres of biologically diverse wetlands. The comprehensive Feb. 13 article "State's farmed peat soil a greenhouse gas engine" is sobering, if not alarming. I knew that Minnesota's ancient yet still living peatlands sequester carbon from the atmosphere and tuck it into long-term storage. I didn't know that mined peat soils are the state's fourth-largest greenhouse gas contributor — right after natural gas, coal and light-duty trucks.
What will happen if the PolyMet mine becomes a reality? The company admits it will directly destroy up to 940 acres of wetlands and indirectly destroy or degrade many more. More recently it says it will cause fewer than 30 acres of indirect wetland losses, but earlier it was more than 6,000. Presumably many of these are also peatlands.
Either way, this will be the single largest loss of wetlands from any project in the state. Almost two-thirds of the 940 acres slated for direct destruction are bogs. If PolyMet is allowed to mine, then more than 285,000 tons of carbon will be released to the atmosphere and the bogs' role as a carbon sink will be forever extinguished.
NorthMet Co. will "mitigate" the loss of wetlands by buying credits from a commercial wetland bank that should be restoring peatlands. But this takes decades to accomplish, and who will care after the mine closes in 20 to 30 years?
For peat's sake! When can we come to our senses and save our precious, historic, long-evolved wetlands from short-term exploitation?
Judy Helgen, Falcon Heights
The writer is a retired Minnesota Pollution Control Agency wetland scientist.
FREE SPEECH
Look who's suppressing
By classifying threats to free speech into two neat categories, threats caused by people who do not want to be offended and threats caused by people who use free speech to justify violence, D.J. Tice deftly marginalizes and politicizes harm to specific demographics ("Free speech threats aren't new, just worsening," Feb. 13). Denial of free speech has long been a way to target people. And today we see that happening when books about Black people, LGBTQ people, the Holocaust and reproductive health are banned from school libraries.