G8 leaders pledge to limit global warming to 2 degrees celcius

Leaders of the world's richest nations along with major developing powers are meeting in Italy to seek common ground on global warming and international trade. G8 leaders have hailed a new agreement to limit global warming to 2-degrees celcius. But getting EMERGING economies to join in might prove challenging. U.S. President Barack Obama is chairing climate discussions, but China and India have already rejected demands to drastically cut harmful emissions over the next 40 years.