Geneva (AFP) - Last year tied for the sixth-hottest on record, confirming that Earth's climate system is in the grip of warming that will affect generations to come, the UN's weather agency said Wednesday. "This is confirmation of the trend of global warming of the planet," World Meteorological Organization (WMO) chief Michel Jarraud told AFP. Last year equalled 2007 as the sixth-warmest year since reliable records began in 1850, with a global land and ocean surface temperature that was 0.5 degrees Celsius (0.9 degrees Fahrenheit) above the 1961-1990 average, the WMO said in a statement. Last year equalled 2007 as...