Guardian: Climate change is what the worlds population perceives as the top global threat, according to research conducted by the Pew Research Center, with countries in Latin America and Africa particularly concerned about the issue. It is followed by global economic instability and the Islamic State militant group. The survey, conducted in 40 countries and taking in the views of more than 45,000 respondents, attempts to measure perceptions of global threats. In 19 of the 40 countries polled, climate change...