A worldwide pact to battle global warming entered into force on Friday, just a week before nations reassemble to discuss how to make good on their promises to cut planet-warming greenhouse gases. Dubbed the Paris Agreement, it is the first-ever deal binding all the world's nations, rich and poor, to a commitment to cap global warming caused mainly from the burning of coal, oil and gas. "A historic day for the planet," said the office of President Francois Hollande of France, host to the 2015 negotiations that yielded the breakthrough pact. "Humanity will look back on November 4, 2016, as the day that countries of the world shut the door on inevitable climate disaster," UN climate chief Patricia Espinosa and Moroccan Foreign Minister Salaheddine Mezouar said in a joint statement.