evidence demonstrating the absence of technically practicable mercury-free alternatives providing significant environmental or health benefits;
fianaise lena léirítear roghanna eile saor ó mhearcair a bheadh praiticiúil go teicniúil lena soláthraítear tairbhí suntasacha don chomhshaol agus don tsláinte a bheith in easnamh;