AlterNet: Ten tragic lessons in our nation’s environmental history that should never be forgotten. And one climate destabilization tragedy in the making that needs our urgent help. 1. Extinction: Three Species Per Hour According to a United Nations report released in 2007, our planet is at risk of losing three species per hour. Ahmed Djoghlaf, the head of the U.N. Convention on Biological Diversity, declared: “We are indeed experiencing the greatest wave of extinctions since the …