More than any other European Union nationals, Greeks worry about the state of the environment but feel there is little they can do to help individually, according to a survey published yesterday. A Eurobarometer poll found that 58 percent of Greek respondents expressed «deep concern» about environmental matters. The Italians and Luxembourgers came second at 44 percent, while the most relaxed approach (21 percent) was that of the Dutch. Perhaps as a result of the 1986 Chernobyl nuclear accident, radioactive pollution topped the list of Greek worries. Most Greeks (56 percent) were pessimistic about the extent to which individual action could help protect the environment, while 49 percent said local authorities were best qualified to handle green issues. And 62 percent called for stricter legislation to fight pollution.