Wordsworth's lakes are dying.

"Be thankful, thou; for, if unholy deeds
Ravage the world, tranquillity is here!"*

Well, not so much. Unholy deeds indeed ravage the world, and tranquility has fled the Lake District. The lakes "are being devastated, mainly by sewage and farming. Some are so badly affected that they are virtually dead.

Mostly they are being fed to death by sewage and - especially - wastes and fertilisers from agriculture. These cause weeds and algae to flourish, soaking up oxygen from the water and suffocating other life. And, partly as a result, they are often plagued by alien, invasive species."
LINK

*LINK to Composed by the side of Grasmere Lake, 1806 by William Wordsworth