Editor's note: Public Agenda occasionally posts guest blogs to offer different perspectives on difficult problems. Readers of this blog know that immigration and the choices we face on energy and climate change are two of the public policy issues we monitor closely here at Public Agenda. Today, we have a guest posting on our blog, from Michele Wucker of the World Policy Institute, who talks about the way that these two issues may intersect – which makes it all the more important that citizens grapple with the options we have in crafting public policy solutions.