Not to worry. The population in the "first" world is growing and will continue to do so by increased longevity and immigration as long as there is wealth and room to grow. Conservation is part of the answer but nothing can provide peak loads as cleanly and nukes.

Nuclear is not particularly clean or safe, but it is a lot cleaner and safer than fossil fuels. The Hiroshima article posted by Foolestroupe seems to have made a good point. A lot of the current fear of nuclear was born out of ignorant speculation and fanciful imagination. According to the media, The Hulk, and Spiderman and Godzilla and melting dirt all the way to China are possible results of nuclear accidents. On the other hand, dead coal miners and acid rain barely get covered.