It found that, overall, daily exposure to the ads declined but the percentage among companies that had pledged to self-regulate was higher than those that didn't.
Shale gas production is exempt from the Clean Water Act and the industry has pledged to self-monitor its waste production to avoid regulatory oversight.
The Department for Transport had previously pledged to allow self-driving cars to be trialled on public roads by the end of 2013.
It is supported by Wellcome Trust but has pledged to become self-sustainable within 5 years.
"For example in Samawah [in Iraq], Dutch, British and Australian forces who shared responsibility for the area pledged to help the Self Defence Force in case of an emergency but not vice-versa".
Hungarian nationalists pledged to observe a self-imposed ban on the practice for 150 years.
Under the agreement announced yesterday by the Justice Department and Laborers International Union of North America, the union pledged to continue its self-policing efforts through the year 2006.
Hollande pledged to continue airstrikes against Raqqa, Iself-proclaimedmed capital city in Syria, which Hollande said had become "the biggest manufacturer of terrorists in the world".
Romney, who pushed the policy of "self-deportation" and pledged to strip deportation relief from those brought here illegally as children, won only 27percentt of the Hispanic vote in 2012.
Fifteen months after being swept from power by a self-styled reformer who pledged to rid his department of corruption, former Sheriff Sidney Dorsey of DeKalb County was charged today with murdering his victorious opponent, Derwin Brown, three days before Mr. Brown was to take office.
He pledged to hold those responsible accountable and said he would submit to "self criticism".
