**Leaders of the G8 leading industrial countries have agreed to try to limit global warming to just 2C (3.6F) above pre-industrial levels by 2050.**The summit, in the earthquake-hit Italian city of L’Aquila, also agreed tough new carbon emissions cuts.
It says developed nations should cut carbon emissions by 80% by 2050, with the rest of the world making a 50% reduction by the same date.
Analysts say there is no indication of how the targets, or costs, will be met.
The summit agenda is also expected to include food security, North Korea and Iran.
UK Prime Minister Gordon Brown said he was confident that other non-G8 countries would back the commitments when climate change was discussed on Thursday under the chairmanship of US President Barack Obama.
HAVE YOUR SAY
“The “global warming” myth has been completely debunked by many leading academics, yet many, politicians believe it for their own purposes.”
*****William Read, UK *****
Send us your comments](http://newsforums.bbc.co.uk/nol/thread.jspaforumID=6705&edition=1&ttl=20090708110440)
The area where the three-day summit is being held is still suffering aftershocks from the April quake and an evacuation plan is in place in case a serious tremor should hit.
Security is also tight and at least 36 protesters have already been arrested.
President Obama arrived on Wednesday, as did Gordon Brown and German Chancellor Angela Merkel.
Russian President Dmitry Medvedev flew in fresh from talks with Mr Obama in Moscow in which the two agreed a framework for new nuclear weapons cuts.
The leaders of France, Canada and Japan are also attending, along with EU representatives.
But Hu Jintao, China’s president, cancelled plans to attend, instead flying back to Beijing amid continuing unrest in China’s western region of Xinjiang.
The BBC’s Bridget Kendall in L’Aquila says Mr Hu’s absence is a setback for the summit.