Original sentence: Environment--current issues.Environment--international agreements.In the first week of the movement's existence, Nevada-Semipalatinsk gathered more than 2 million signatures from Kazakstanis of all ethnic groups on a petition to Gorbachev demanding the end of nuclear testing in Kazakhstan
Edited sentence: Environment—current issues.Environment—international agreements.In the first week of the movement's existence, Nevada-Semipalatinsk gathered more than 2 million signatures from Kazakhstanis of all ethnic groups on a petition to Gorbachev demanding the end of nuclear testing in Kazakhstan