UN: Greenhouse Gases Hit Record Levels Last Year
The United Nations says surging carbon dioxide emissions sent greenhouse gases in the atmosphere to record levels last year.
In its annual report on greenhouse gas concentrations Tuesday, the World Meteorological Organization said carbon dioxide levels between 2012 and 2013 marked the largest yearly increase since reliable global records began 30 years ago.
A large percentage of carbon dioxide emissions are absorbed by the oceans.
In a statement accompanying the report, WMO chief Michel Jarraud warned that "past, present and future carbon dioxide emissions will have a cumulative impact on global warming and ocean acidification." He said the "laws of physics are non-negotiable."
Many scientists believe that increased greenhouse gases are responsible for global warming, or the warming of the atmosphere. Jarraud has said there is no doubt that global temperatures are rising.
Eastern Ukrainian City Shelled Overnight despite Truce
The city of Donetsk in eastern Ukraine was shelled overnight, despite a cease-fire signed by the government and pro-Russian separatists late last week.
Witnesses say Ukrainian positions in the rebel-held city were hit by mortar and rocket fire four times during the night.
It was unclear if there were casualties.
The cease-fire has largely held across eastern Ukraine since taking effect on Friday. But fighting has been reported in parts of the region, especially in the industrial hub of Donetsk and near the port city of Mariupol.
On Tuesday, the Interfax news agency reported that four Ukrainian servicemen have died since the cease-fire was signed. Defense ministry official Vitaly Andronaty also told Interfax that 29 people have suffered wounds.
Both sides blame the other for violating the truce.