Your canopy is disappearing, you're likely to freeze.
NASA's Earth Observatory reports that over 1,110 acres of forest were illegally logged, during the past four years, in the Monarch Butterfly Biosphere Reserve in central Mexico.
Monarch butterflies travel here from all over the United States and Canada. Images from the Ikonos satellite tell us though, that future migrating butterflies are likely have problems in this reserve. The top image is from 2004, the bottom image shows what things are like now.
Without the trees to protect them, the butterflies could dehydrate from the increased exposure to the sun or die from the colder temperatures at night.
There's more info here.