Christian Science Monitor: Rising sea levels are what some nations fear most about global warming. But in Europe, climate change is likely to mean a new flood of immigrants from Africa and other poorer countries, according to a new report. That was one of the issues before the heads of state from the 27-member European Union as they gathered in Brussels Thursday and Friday to address climate change and, in particular, the security threats it raises. Unchecked climate change could not only cause a flood …