Dan Kraker and Elizabeth Dunbar of Minnesota Public Radio described the current and likely effects of climate change in their home state, particularly on the changing makeup of the northern forests. They noted the changes already occurring in Minnesota's climate, with warmer temperatures on average, especially in winter, and bigger downpours of rain. Red maple trees, which tolerate warmer temperatures, are moving northward. Cold-tolerant pine trees are dying out. While managers of Minnesota's forests know their world is changing, they disagree on how urgently new species should be introduced…