Reading comprehension – Nobel prize winner Al Gore urges US and China to do more about global warming

Global warming campaigner and former U.S. Vice President Al Gore says it is time for humanity to stop " war" on planet Earth. Gore spoke today in Oslo after the Nobel Peace Prize. He the two largest carbon-emitting countries - the United States and China - to what he called the "boldest moves" to fight global warming. The United States has not ratified the Kyoto Protocol, the 1997 international pact that reductions in greenhouse gas emissions. China was not required to emissions under the deal. They also today to approve a new treaty designed to emissions by 25 percent to 40 percent by 2020. Gore said he would go to the U.N. climate meeting in Bali later this week to world leaders to meet as often as every three months to a global cap on greenhouse gas emissions by 2010. Gore the 2007 Nobel prize with the Intergovernmental Panel on Climate Change, at today's ceremony by Rajendra Pachauri. Pachauri the link between the fight against climate change and peace. He that severe climate change will what he called "dramatic population migration," as well as war over water and other resources. He also warned that up to 250 million people in Africa could what he called "increased water stress" because of climate change.