A CNN/ORC International poll released Monday indicates 34% say they’re very concerned about the situation in Syria, with 46% saying they’re somewhat concerned. Only 18% say they’re not worried about the conflict. More than 40,000 people have been killed in the 21 months of fighting between the forces of President Bashar al-Assad and rebels trying to overthrow his regime.

But by a 52%-43% margin, Americans oppose Washington and other countries using military airplanes and missiles to try and establish zones inside Syria where the opposition forces would be safe from attacks by the Syrian government. Fifty-five percent of the public opposes the U.S. and other countries sending weapons and other military supplies to the opposition forces.

And the poll indicates that by a more than two-to-one margin, Americans say no to the U.S. or other countries using ground troops to try and establish safe zones for the rebels.