Leaders at the Pentagon are not among those who deny the reality of global warming. They’re working on strategies to respond the effects of climate change. They are also trying to reduce dependence on fossil fuels through the use of alternative energy. The Defense Department consumes 90 percent of fuel used by the federal government, at a cost of $16 billion in 2008. No wonder the Pentagon is experimenting with fighter jets fueled by a combination of jet fuel, cooking grease and algae (Orion, May/June).