Paris, Safar 19, 1437, Dec 1, 2015, SPA -- US President Barack Obama was "optimistic" about the chances of success of the climate conference in Paris, stressing that the fight against global warming was "mandatory" for the economy and security. He said during a news conference in Paris on the day after the speeches delivered by 150 heads of state and government to reach an ambitious agreement to reduce greenhouse: "The fight against global economic and security we need to address it now, because at the current pace, we will have quickly to allocate more to cope with the consequences of the planet's economic and military resources changed." --SPA 19:06 LOCAL TIME 16:06 GMT www.spa.gov.sa/w